My older brother jerked off on my face while i was asleep

I am a 18 year old girl and my older brother is 20. Anyways when both of us were younger (like 12 and 14) we used to take showers together for fun and just because we were curious. He asked me last night if we could do that again, and I declined because I have a boyfriend and he has a girlfriend and I thought it was wrong. I went to sleep, and while my eyes were shut I heard my door creak open, and I opened my eyes a crack, and he was totally naked! He thought I was asleep though. Then, he started rubbing his dick on my face and even into my mouth and I was totally grossed out, but I didn't want to show that I was awake because I didn't want to get him in trouble. He kept rubbing until he came and then he started licking it off my face and out of my mouth! GROSS! I can't believe he thought that I wouldn't notice this! Now I am freaking out because my older brother has been my best friend all my life and he did this to me against my will. I can't even face my boyfriend now or his girlfriend, or especially him. What should I do???