I had to tell a white lie and i feel bad for beeing dishonest. How to cope with this?

Last year I used and app to talk about my POCD and people called me a pedo and told me to kill myself. It has been months and I had even forgotten about it, but I talked about my mom yesterday and I feel a sense of doom now. Like, I could have lived my life normally, but this happened. I feel overhelmed, and don't know exactly what to do, cuz when I stop to think about it, it is something awful, but I spend months just not caring, I don't know what to do, it was not even close to the worst thing that has ever happened to me, but it still feels terrible, it keeps echoing in my mind, and It won't go away, and yes I know it is OCD, I just want to let It go. And I lied somethings to my mom cuz if I told the whole truth she would be even more heartbroken (I just didn't say what app it was and I said it was recently, and not months ago) And I feel bad, but now I can't go back, but if I told her the whole truth, she would've just broke down. Basically she thinks it was yesterday and in another app, and I told her I just commented on something. But I feel so bad! I don't want to tell the truth to her, but also, I don't know...

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.

I often feel like i did something wrong even tho i am positive i didn’t, my boyfriend and i have been together for like 6 months and i’ve been completely loyal to him the whole time but recently i’ve been feeling the need to confess that i cheated on him even tho i didn’t and there’s absolutely no proof that i did something even close, i don’t talk to other men and if i do my boyfriend has full access to my phone and it’s usually a friend or me asking a simple question but i still feel the need to confess even tho i’ve done nothing wrong🥲 someone please help it’s so confusingggg