I think I cheated

I feel like the worst human in the world.

Me and my bf of 7 months broke up and then recently got back together again, when we broke up it was less than a week before he kissed a girl and told another he had feelings ( so it’s already kinda complicated) but when we got back together he told me that he didn’t feel anything for them. He hasn’t told any of his friends that we are back together yet after a month and we have to hide our relationship which I don’t like. He wanted to come to a party with me last night but I said no bc I didn’t want his friends finding out about us on social media. So I was kind of upset and missing him when I went to this party and I got so so so so drunk. Then this boy passed out and when he woke up again he came upstairs to were me and some of my friends were he kept stumbling everywhere so I tried to help him sit down, and then sometime during that he started to kiss me. I feel shit because I kind of leaned into it at first and then after a couple of seconds I realised what was happening and pushed him off, he was really apologetic and nice about it and I kept saying sorry. I just feel like shit bc I did find him really attractive and I was being friendly with him before but I didn’t think that him being friendly back was flirty or that he’d ever want to kiss me, I just feel absolutely horrible about everything and I don’t know if things with my boyfriend are going to work out now bc he said he can’t trust me and i don’t blame him. I shouldn’t have had so much too drunk and I feel so guilty and unsure of what to do, am I a terrible person because I feel like one right now.