I feel horrible but I know I shouldn't

Ok. So this guy and decided to be friends with certain benefits. Sex wasn't really up for the offer until it came to actually doing so. One night the guy and I really wanted to have sex and all signs were leading that way. Everything said "YES! Do me NOW!" Well he came inside me and without warning, without telling me, and without making sure I was on the pill. I only confronted him about it until I got up to go to the bathroom and saw it all. I wasn't on the pill and he just assumed I was. I know I should want to destroy him but I feel bad bc I'm a grown woman and could've said "Hey, don't cum inside me" or "hey, do you have condom?". I could've done something and I'm beating myself up about that but I'm not sure at this point who was in the wrong completely and needs to say something. 
P.S the guy was planning on leaving right after it happened and not tell me but I caught him in his tracks and confronted him...