Pure O (Should I tell my new girlfriend?)

So i play in a band, and we were having practice, and my girlfriend was there listening to us, then this girl around our age walks in, and my head tells me to cheat on my girlfriend with her. I know i would never do such a thing. And it bothered me for days. And i ended up telling my girlfriend, and tried to explain my ocd. It hurt her and she believes that the instrusive thoughts, are my thoughts so in that, i must feel something behind them. And she feels hurt because i explained to her the obsessive part of ocd and how this thought wouldnt leave my head. And she got upset knowing that i was constantly thinking about cheating on her. I cant help but feel its all my fault. And now that she doesnt understand i feel really guilty for my thoughts and they are coming more often and worse. When i was fine for months, but my ocd always acts up right as i get in relationships, then i usually tell my spouse and tell them i cant feel guilt for my thoughts or they will get worse. And they usually just accepted it and it was easy. But with her it seems she just cant seem to understand, ive tried to explain it to her countless times, she isnt willing to do research with me to help better understand it or anything. Maybe for my first ocd issue telling her that wasnt the best idea.

I’ve had so many moments of clarity with my OCD that I love my boyfriend and I’m beyond willing to go through this to be better and be with him. in the back of mind I’ve in a way known I was at least somewhat sexually attracted to women (I’m a woman) since the start of the ocd it was always like “okay. Fine, but I don’t want to date a girl” I only just realized this after the ocd started, I never really argued with this. my ocd has always revolved around if I’m romantically interested in women and not men. I’ve done so many compulsions through this year and a half and 9 times out of 10 have come to the conclusion that I don’t want to be with a woman romantically. I always end up feeling like I know I love my boyfriend. But the doubts don’t stop about whether I want to spend my life with a woman instead, my heart literally breaks to think of not being with my bf and imagining him with someone else. I don’t want to be with a woman I know deep down somewhere underneath the anxiety that that’s not what I want. It doesn’t feel natural for me, unfulfilling. I want to tell my boyfriend about the possible sexual attraction to women (ik it’s still ocd related) but I’m scared that once I tell him, I’ll realize that I actually do want to be with women and not with him. Ugh I’ve spent hours today ruminating about this after being solid in my commitment with him for a little while, I’m stuck in this loop and idk how to get out right now

Last night I had a fucked up intrusive thought/urge about harming my partner and I'm spinning out today. I let them know I had an intrusive thought and was struggling with compulsions around it and future repercussions, but did not tell them exactly what the thought/urge was, which they accepted. Do y'all share details with your partners about harm ocd? How can we healthily ask for support from people we are having horrible thoughts about?