Feeling guilt

Ive been having terrible irrational thoughts that Ive cheated and don’t remember. Like the guilt made me repress the memory and im actually an awful person and someone’s gonna expose me. I know it’s not true and I love my boyfriend more than anything but i feel so guilty for something ive never done. its been making my life so difficult and i dont know how to explain it without sounding like im covering something up :( Its making me think that I need to break up and i don’t want too, but the guilt and anxiety is eating away at me. I feel like I need to get better before I continue on or i’m going to permanently ruin everything with my mental illness

I had a life before I was with my partner, that involved having girlfriends and one night stands, etc. That's a lifetime of memories that I now feel guilty for having. Something as silly as watching a TV show with my girlfriend will make me think "I used to watch this show with an ex, is it ok to watch it with my current girlfriend?" and I will feel real guilt over it and need to seek her reassurance. There are other memories, about "intimate" times, that sometimes come into my head and I have urges to share them with my girlfriend to alleviate the guilt I feel for having the memory. Fundamentally, I feel guilty every time I have a memory of an ex, often regardless of the content. I feel like I shouldn't have thoughts of anyone else other than my current partner and it's wrong to have memories of exes. When I do, I feel guilty, ruminate, then have the uncontrollable urge to share the memories with her. She gets upset, I get upset, but also feel relief that I've shared. Does anyone have any similar experiences and/or tips around this sort of issue? Thanks.

I adore my partner. There’s this other guy my ocd has been triggered by from the start. He hangs out with my friends, we used to hangout before my partner. I feel like I’m so wrong for still hanging around him in social settings. Its just fun sometimes. I have fleeting feelings and there’s kind of a flirtatious vibe? I’m scared I’ve flirted. I’m scared of the “feelings” I get even though I know feelings can have zero significance when I love my partner so much. I overanalyze everything. The guilt is overwhelming. I want to be with my partner not this other guy. I feel like a terrible partner. I know this could all be OCD why does it feel so hard. I think my brain has so much worked up over this other person no wonder I feel so much guilt. My OCD makes everything into a big deal.