Cheating

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 was doing fine today until I asked ChatGPT if i cheated and they said it could count as emotional cheating if you are engaging in intense daydreams and looking someone up on social media to feed a fantasy about them. My partner and I already spoke about me fantasizing about this person and he said it was totally fine since it happened in my head and he has had crushes and fantasies on coworkers too. However I feel absolutely devastated and wrecked with guilt and anxiety and panic right now. I genuinely feel like a horrible horrible horrible cheater. I don’t know what to do. I have therapy scheduled for later this week but I really really need some advice right now!!! I feel like it could count as cheating since it did happen during a few weeks where i felt a bit distant from my partner and I feel like the daydreaming was excessive. I am so so scared. Do I confess? Do I tell him I cheated? He already told me once that cheating is a physical interaction (and I literally have not interacted with this person outside of surface level responses in a group server that my partner is also a part of). Do I have a moral obligation to tell him I cheated? I need to know.

my spouse cheated on me on our wedding night and i haven't gotten over it. they never told their parents and i was resentful their parents didn't know. so i called them and told them today. it felt good in the moment to have that extra support from my in-laws but im freaking out now that i have to confess to my partner and they will feel betrayed by me and leave me. is this confession OCD or a real fear? i'm really freaking out.