I think I was sexually assaulted...

So last night, my best friend, her boyfriend, our friend (we’ll call him Eric) and I drank last night and we all got pretty drunk. I was the first one to go to bed and “Eric” cut his finger accidentally and was bleeding (I was asleep when this happened, my best friend told me about what happened this morning). He got blood everywhere... on the kitchen floor, door handles, etc. When I woke up this morning, I went to take a shower. I slept in my bra because I was pretty drunk and didn’t feel like taking it off. Anyways, I took off my shirt and looked in the mirror and there was blood on the outside of my bra and a little bit on my boob. I feel like he did something to me while I was sleeping. I confronted him about it when I got out of the bathroom, but he claims he “doesn’t remember”, but I could tell by the look in his eyes he’s lying. I’ve been sexually assaulted by 3 guys now and it’s making me feel like I don’t want to live anymore. I feel disgusted with myself... what did I do wrong?