My best friends ex took advantage of me.?

My bestfriend and her boyfriend broke up less then a week ago. We all hung out last night and after she left we all had some drinks. It was me and four other guys which was a big mistake but everyone was hitting on me except for him so I spent most of the night hanging with him because I was uncomfortable. I was really drunk and he was sober. He eventually started holding me and kissing me and I told him to stop because it wasn't right. I got up and left but being drunk eventually ended up being near him. It was time for me to leave and I hugged him and he started making out with me I pulled away and kept saying no but he kept pulling me back. I left upset and I still feel used and betrayed. What do I do? Do I tell my friend? Is this my fault that i let this happen?