I am feeling depressed and hurt, please give me advice.?

When I broke up with my boyfriend, I hang out with one guy that I rly liked we were together just one night and we only kissed but I felt the pion between us, I've never felt something like this. The next night we were out in a club he was with his friends and I know them, so we were together on a table. I was talking with one friend of him and than this boy came and asked me "Can I borrow my friend just for 5 minutes bcs there is one girl out there and I want to be with her". I felt rly nervous, I didn't know what to do so I get drunk and I spend the night with his other friend and I felt hurt and kind of good. Now I login in facebook from his bestfriends account and I asked him like I don't know what he was doing the last weekend and he told me that he was with one girl, but the other night that girl f***d with his friend, she is a s**t and things like that. Why is it always that the boys are right and girls wrong, he did something that hurt me AND HE KNEW IT why would he do that?