Cheated on my boyfriend F22

I went out on halloween with some friends and without my bf. He already had planned to go to a party and we planned to meet up afterwards. I got pretty drunk. I was dressed up as Alice from Alice in wonderland and this guy said "Hey Alice nice pigtails" and he was pretty forward and we flirted. I ended up going back to his place and I told my bf I wasn't feeling so good and was going home instead of meeting up. I haven't met this guy since then.