I feel like i might have betrayed my boyfriend

I know what I did was really bad but I need to get this off my chest..

||So, for 3 months now I am dating this amazing guy. We had a bit of a rocky start but it's a lot better now.
We have a strict no-same gender friends rule, that has applied the whole time. Before we started dating I had a male friend and we got a bit distant for a while but when it got rocky with bf I got closer friends with the guy and we ended up spending time, no 1 on 1 ofcourse but in our friendgroup and were quite close(we did hug a couple of times..)..I didn't really think it was that bad at the time because I had no idea how serious this might be but now thw guilt and regret is eating me from the inside..I can't tell my bf rn either because he's about to go under serious surgery and I can't stress him more..what should i do?||