Having trust issues

Hi everyone! I have been having a rough time. So my boyfriend talks to his ex still as friends and I’ve been struggling with it lately and I can’t tell if it’s OCD or not but it does feel so distressing. She wasn’t texting him for about 2-3 months as she got into a relationship with this guy and they broke up. She had messaged him saying that she has no one else to talk to and needed to vent to someone. At first I felt okay, but my intrusive thoughts took over and it seemed like she was trying to get with him after the fact. It’s probably just my intrusive thoughts talking but he looks on Discord (the app where the message) constantly now and my intrusive thoughts convince me that he’s still in love with her. Then yesterday I saw one of his BeReals (a little photo app that shows a photo of the day) and I saw that he was watching one of her streams as she is a streamer. I struggled to talk about it because it made my worst thought feel like it came true where he is still in love with her. When we talked he gets a lil mad that I don’t tell him right away like straight up what I’m feeling but it’s hard to process because my thoughts flood in of all the worst things and I don’t want to come off as toxic at all and I know relationships are built on trust and I want to trust because this is literally the only thing that makes me nervous about him. It also doesn’t help that I’ve been cheated on before so I’m trying to protect myself but I’m lost. I get so depressed and so anxious because I feel like I have to grieve the relationship and it’s just so dramatic. I’ve never loved anyone like this before and I don’t wanna lose him by bringing this stuff up constantly when something occurs with his ex. I don’t know why I get triggered so easily and I just wanna heal from it and be the good girlfriend I’m supposed to be 😭

I don’t know where to begin, this is going to be very long. But whoever responds I appreciate you dearly. I’m 20 years old, I’ve dealt with a lot in my childhood with abandonment and insecurity issues from my family. Aswell of not having a role model of a healthy relationship shown to me as a child. Me and my boyfriend have been together for 3 years, my first healthy relationship. Last year I discovered OCD (I am diagnosed but I ignored my mental health as a teenager like anybody would) I started to get these feelings that I don’t love my partner/he’s not attractive enough/ etc etc. I’ve discovered that it’s ROCD. I made threads on Reddit asking for advice googling for reassurance, all the things as one would do with ocd (as I’m doing now!) One day I woke up and that theme was gone, I felt normal in my relationship for about 4 months with no terrible thoughts. As of about 2-3 months ago, my theme switched. Now I have a fear he doesn’t love me, he’s cheating, he doesn’t want to marry me. It has utterly consumed me (just like my last theme!) I check his phone an unhealthy amount (guess what I never find anything!) He always lets me go through his phone, but as anyone would he gets annoyed and frustrated. I always am searching for signs if he’s acting weird, will get into arguments 24/7 because my brain keeps telling me he’s cheating, I get fake scenarios in my brain, hell I even bought Snapchat+ to stalk his snap score. But ever single time I find nothing. A lot of things trigger me and I over analyze everything, phone calls who his texting. When I do search his phone I check his EMAIL because of how paranoid I am. When I see things on social media about people cheating I SPIRALLLL But what really triggered me was this scenario, his family loves to joke around with me and mess with him at the same time, especially with our relationship, saying I have a leash on him etc etc making jokes (which I can take but when I’m in an ocd spiral and they have no idea something’s are triggering) anyways, we were out to lunch and his mother texts him “are u at some girls house” he told me straight away then responded “why would u say that” then she proceeded to say she’s messing around with him. And sent a picture of me and said I’m with Hailey at lunch, then they had a normal conversation after. Obviously this sent me into a spiral, it still bothers me. I was so upset and anxious, when we got back to his house I went through that man’s phone like it was my only job in the world. And I search EVERYTHING not one thing goes untouched. (I sound insane) anyways we went back to his place, then he called his mom to come in his room and asked why she said that, she felt guilty and said she was messing around she had her hands in her head (mind you she’s been drinking probably just messing around with him when she texted that) she told me not to worry ever about that kind of stuff because her son is not that type of man, she proceeded to leave the room then texted me about how sorry she was and didn’t mean to freak me out and felt like shit about it. Ever since then she’s been acting kind of weird towards me (not really) maybe she’s uncomfortable or there’s another women idk LOL. Anyways yea what the hell do I do I literally can’t function properly.

i made a first post about this, this is the second part. but i decided to stay with him and things took a toll today. lately, for weeks now, i can’t get the thought of him cheating on me out of my head. some things have happened to cause me to think like this but recently it’s gotten worse. we got into a huge huge argument today and we nearly broke up. we had set a rule on instagram about updating each other when we posted or changed our profile photo bc he had trust issues with that in the past so we set those rules for him. and I gladly did so. but then today i texted him, nearly 10 hours went by - no response - then i open up instagram and he posted something without letting me know. so I got upset told him if that’s how he wants to do things then he can. then he got upset because i always “assume” things without asking but there was nothing to ask because you’ve been on your phone but you can’t text ur gf back? he claimed he was asleep and he woke up to post, and he said he saw my text but he didn’t feel like talking to me and didn’t know what to respond to with. on top of that his posts r made for a female audience. and then he said “you’re tweaking when ive only been gone for 9 hours”, but yesterday he got disappointed when i didn’t respond within an hour. and I told him his double standards are insane. he got mad. told me I should just leave him since he’s not enough and I made him feel like a sh*tbag. I don’t know what to do. i want to be with him but everytime we fight we end up fighting against each other and not the problem. he told me i need to ask before i assume things, but when i ask he says “im tired, i don’t wanna do this right now, im not worried about that can we just chill”. I don’t feel emotionally safe to open up to him. and he takes everything as an attack. he told me I should be with someone I trust but he’s not understanding that I want to trust him and I want to be with him and the reason why I don’t trust him is because of things he’s done and not because of my past, he thinks im projecting my past onto our rls. we decided to see if we could go 2 weeks without arguing and if we can’t we need to breakup but how can I improve my trust with him and our rls in general?