My ex said he is dating someone else..m I'm broken

i couldn't take this anymore. maybe i'll just let ocd win this time. it's too hard to not have a clear conscience everytime i'm with my bf cuz my mind is telling me i'm unfaithful and don't deserve to be happy. i feel like i'll never get better anymore. i already told myself many times to stop attracting attention from other people especially to people i'm having false attraction to. but i did it again yesterday, right after i smiled a little extra in front of that girl i might be attracted to i could feel the massive anxiety in my chest. already decided last week that i might be actually attracted to her so it's best to fully avoid her. i avoided her with the best i could, but we're in the same classroom and i saw her in my peripheral vision looking at us (my bf and i) whispered to myself not to make any mistake i'll regret, but then i felt like i lose control and laugh a little extra. i searched micro cheating and it says there "trying to impress someone you're attracted to" and now i want to break up with my bf. the guilt is too strong. i couldn't sleep at night.

I’ve just recently found out that Relationship OCD is a thing. I feel like I relate but it also feels like relationship trauma. I’m in a fairly new relationship and I keep telling myself that things are going great, we are good, he cares for me, but does he? There’s this unbelievable amount of self doubt that sits in me because of what my ex did to me many months ago. I kept getting told that I do too much, i smother, need constant reassurance, then got told that I don’t care enough, the things I do aren’t enough and that I’m not enough. I feel like I am waiting for the day that I get broken up with because of these “problems” just so I can be proven right at the fact that I should be considered unlovable. I go through this every month around my period because I get so emotional and nervous that I stress over the idea that he doesn’t like me. How does someone continue a relationship with Relationship OCD? How do I explain it?

My psychologist tells me because my thoughts are based off of facts/ broken boundaries which is why I am having thoughts of am i in love , am I settling , and feeling guilty I should let him go to find someone who wouldn’t doubt him that I do not have rocd. She states rocd is intrusive , irrational thoughts not based off of real facts and I may have ptsd not ocd. He kissed someone else before we were official and he finds a certain type of female attractive that I find disgusting . So I spin about these issues all day long to the point I’m so unhappy with him and had to break up . It’s been over a month now but I’m still severely anxious and depressed The thing is I can’t stop thinking about this 24/7 with severe anxiety and depression and nothing is helping me . Can someone please tell me their thoughts