Am I (21F) Overreacting to My Boyfriend (26M) Having Sex With Me While Asleep?

So my (21F) boyfriend (26M) and I have been dating for 2 years. He recently decided it would be a good idea to have sex with me while I was asleep. I woke up in the middle of him doing this to me. It was also in the form of a sexual act I have told him repeatedly I don't like and I'm not okay with doing. He was also watching porn while doing this to me (he forbade me from ever watching porn, he said it was gross and I shouldn't feel the need to watch it).

I'm a victim of childhood sexual abuse and I also believe in always getting consent, so I didn't react well to this happening. At first he told me I was being ridiculous and he left for work. While he was at work I thought about what happened and let him know I wasn't comfortable with him anymore and was leaving. He raced home to talk me out of it and after a lot of arguing he agreed he was wrong and I thought that was the end of it.

A couple days after that he met up with his sister and they apparently were talking bad about me because he came home upset and wouldn't tell me why. He decided at 3 AM he was going to start an argument with me and he told me basically he and his sister agreed that it wasn't non consensual sex and he's allowed to do whatever he wants to me because he's my boyfriend and he's seen my hard. This hurt me on top of the fact that he lied about agreeing with me before and being sorry about it. He clearly resented me the whole time that's why he went to his sister.

So fast forward to today, I moved out to on-line with friends while I navigate this issue. He has been very accusatory and still won't accept responsibility for what he did even after I left. He even called his sister to complain about me some more and had her send an insulting text to me. He also screenshot a bunch of stuff in our private Snapchat conversation and sent them to his friend.

The reason I am here is I have had such a hot time getting these people to understand why what he did was wrong. I'm wanting to know if I'm actually being ridiculous or am I valid in feeling this way? Did he mess up or did I just blow it out of proportion?