I'm feeling scared and paranoid, please calm me.

Hey guys, just wanted a bit of advice as I’m sure my friends are sick of me constantly asking them for reassurance and to be there for me. I use to be very close friends with this girl who had kids with a complete an utter nasty piece of work, anyway when they were together I was friendly with him as he was with my close friend and that’s only right, even though most people despised of him, I never see the bad in people. Then when they broke up he came to my home a few times to chat and for advice, which I gave him, he then tried it on with me sexually and I obviously declined in which he didn’t like, I then had the decency to tell me friend the mother of his children and it back fired on me for trying to be the good friend by telling her the truth, she then took his side in which I lost all respect for her as I was trying to do right by her for telling her what had happened as o hate things like that on my mind. After this he came to my house and threatened, send me a whole load of abusive threatening voice notes too like the vile human he is because of course he got found out. I drifted away from her because of the situation and clearly trying to do the right thing was the wrong thing, we have briefly spoke since this happened a few times within the last three or so months. This caused me to have severe ocd and have the worst paranoia, I don’t want her in my life, I don’t even have her number saved but today she turned up at my door unexpectedly just to ‘pop in’ although I don’t want anything to do with her, the whole situation makes me feel ill, makes my ocd bad and bad paranoia. What can I do?

Does anyone else have mental rituals to check whether your friends still have u on social media and if they don’t then they hate you? I have to check multiple times a day that they still follow me , even people I haven’t spoke to in years . Today one unadded me from a private story even though I haven’t spoke in over 2 years but now it’s triggered me and made me feel like they hate me and I’ve done something wrong. Could anyone offer advice on how to feel in a situation like this. Like should I be panicked and concerned? Thanks

Recently I posted on here about talking with a guy and exchanging information. After we briefly talked, I didn’t feel comfortable to keep talking to him so I blocked him. I just didn’t feel safe, not really knowing who this person was. Or at least I thought so. After the fact, I looked up his number and was able to track down his LinkedIn and Facebook page. He seemed legit. Well, I didn’t know that LinkedIn actually tracked your profile views and he must’ve realized I looked at his page. Late last night, he added me on snap. I didn’t add him back, and he hasn’t contacted me on any other social media. But now I’m worried and obsessing over this situation. Should I just let it go or address it?