How do I not let myself get obsessed with the thought that my boyfriend will be attracted to other girls sometimes? I know it’s harmless when it’s just a thought in his head but It feels so hurtful and disloyal to me

For about a month now I’ve been really obsessed with the idea that my girlfriend has feelings for this guy we know if he has feelings for her. We’ve only known him for about a month and we’re not that close to him. The stuff that makes me worried is completely normal for friends to do or are things that aren’t real. . They respond to each other on group chats . They hangout in groups when I’m not there . She finds him funny and smiles when she’s around him . I just have a bad feeling It’s become such a thing in my mind and it’s deteriorating our relationship. Every time I see him and her talk I feel mad and sick and anxious. And now I’m starting to hate him. I feel like I’m being so unfair because she hasn’t actually done anything, and I keep accusing her and treating her like she has. She says she feels like all I see is the worst in her and like she’s a bad person. I’ve brought this up to her many times and every time she tells me she would never cheat on me and that he’s some random guy and that she doesn’t want him she wants me. I just can’t get the idea out of my head, I can’t stop unconsciously looking for signs of romantic feelings between them. I analyse her body language or how she looks at him, I check if there online at the same time to see if their texting or something. It’s really bad. It’s gotten to the point where it’s not about the idea that they have feeings anymore it’s more just I want to get the idea out my head. I want to stop seeing this. Because she would have said something by now. And I know this is coming from a place of fear and insecurity about myself and the way she feels about me, because he’s no different to any of her other friends I just chose him to be the one I worry about. I want to get past this because our relationship needs to move past this and I want to be able to enjoy the time I spend with my friends instead of relating it to this and the idea of hanging out in this group with her where he is, and if causing instant anxiety. She’s not like this, she’s a good person. It’s not necessarily the idea she’ll actually cheat it’s the idea she’ll develop feeling or he will and will make her catch feelings too. It’s all just a “bad feeling” I have and an obsession with this idea. I can’t stand to be around them in a group cuz all I can see is that “she’s in love with him” or “he would make her or does make her happier”

I stated dating my boyfriend about 3 months ago. This is my first boyfriend ever. He’s been in 2 serious relationships in the past and multiple sexual partners. I’ve had neither. When we first started dating/ at one point were just friends, he told me a lot about the last girl he was in a relationship including their sex life. Fast forward to us dating for about a month and I found out he had been texting her. We almost broke up. But also for context she broke up with him because she figured out she was a lesbian. But still… anyways we moved past it. And now… I’m sure we can all see this coming… I have this theme! I think about his ex gf all the time. I stalk her on social media and try to find hints and clues about their relationship. I compare myself to her. It really impacts my relationship because I’ll get mad at him for no reason. For example we went thrifting recently and he picked out stuff that completely wasn’t my style, but was hers. Which made me spiral. Is he purposely dressing me like her? Does he want me to be someone else, someone like her? The whole texting her thing was put in the past. I’ve forgiven him. But I can’t help but have resentment towards him and think/ visualize all these thoughts about them together and how I’ll never measure up to that. It makes me think I shouldn’t have got into a relationship. That maybe I’m better off by myself. But like all of us. I wish I didn’t have these thoughts. I wish I could believe he liked me for me. But sometimes it’s really hard.

My mind won’t let me trust that my boyfriend loves me and it’s the most frustrating thing ever. Honestly idk if this is rocd but recently we’ve been really great and our relationship has been strengthening so much. He gives me no reason to fear him leaving or anything or even cheating. He’s very loyal and has shown that he loves me. But my brain keeps pushing me away and at the smallest things he does I think maybe he doesn’t and I’m scared to fully put my all into him bc I think I’ll get hurt, every time i notice a small thing I don’t like abt him, it worries me and makes the thoughts worse. Basically to sum it up I won’t let myself just trust that he loves me and that we’ll be okay, I keep focusing on the future and what ifs like if we break up or something happens and it’s like I’m trying to protect myself from the future. It’s so stressful and annoying, I can’t predict the future so I just wish my mind would be calm and let me live my mind. No matter what I do I can’t shake off the fear.