Terrified partner will think I’ve cheated

I’m at a loss about what to do. I’ve been with my partner for about a year. I’ve wanted to be with him for 3 years and now I finally have him, I got out of a really toxic 11 year relationship about 4 years ago so I’ve had plenty of time to heal, things where going so great at first in our relationship and I’m still very much happy with him, I love him more than anything, but the past 5 6 months I’ve been having a constant fear that he’s gonna cheat or watch 🌽behind my back any chance he gets , I know that’s a touchy subject for some, but me personally it just makes me feel that I’m not attractive enough,or feel like I’m not good enough, I’ve never found evidence of cheating, and I’ve found 🌽 in his history once but I told him how I felt and he told me he understood how I felt and wouldn’t do it again,and I know the constant asking everyday and needing for reassurance with it is putting a tear in our relationship, I just want to fix it. Does anyone have any advice on how to redirect my brain whenever I start overthinking about it when I’m not around him? It just puts so much stress on me when I’m not around him cause I’m just constantly in my head about it.

So everything has been going well recently. The only thing pressing is for peace of mind I am getting STD tested on Wednesday morning and I am pretty anxious about what the result will say. I go to certain massage parlors that offer extras. And I have made a point to not engage in intercourse but other non-intercourse things I have done. I was afraid that since those women do other things with people that maybe virtual things were left on the beds I would lay down on or something. I told this to a doctor I saw recently and they said it was highly unlikely. But I still have the health worry. But we will see come Wednesday. The only reason I am going is because I went to the urologist and they wanted me to rule things out since I had what seemed like a UTI but it turned out to not be the case. What's a good way to not focus on catastrophizing the situation. I keep worrying that my life is over if I am diagnosed with something and my future relationships will be tainted or I'll put someones health in jeopardy

In September I had unprotected oral sex. I haven’t had sex in five years because even before that I was so ashamed and worried about sex. I finally did it and then a few weeks later while I was at work I started to be very itchy all in my underwear area like up to my butt. I didnt see any blisters or anything but when I googled it, herpes came up. Eventually I thought maybe it was the new underwear I bought and it went away after I stopped wearing them. However it’s returned twice, mostly when I’m really worried about herpes. I know this makes little sense because I don’t thinking about it would cause an outbreak but, either way I’m really nervous to go get tested because I heard there’s a high false positive rate and if I get a positive there’s a huge chance I will just become a recluse and never speak to anyone again. I already have so much trauma with sex, vaginismus, etc. I can’t imagine telling anyone I have herpes and then they 1) don’t want to be with me 2) now know this and could tell anyone they want Even if I don’t have it I was reading it could be asymptomatic and 80% of people who have it don’t even know, so now I’m worried I will get it no matter what sex I have. I can barely handle staying alive with just OCD but now with social stigma with herpes I will feel like I can not even live a normal life. I am already freaking out about it and don’t know what to do. I am worried to go get tested and it saying I have it, and then I’m worried to not and potentially spread it, I’m not even having sex with anyone right now so it’s not like I would. But I’m worried I will forget to wash my hands and touch something and someone else will touch it and then get it. I’m just having a really bad time.