Advice: Boyfriend Sexually Assaulted

This is a really complicated situation so fair warning that this may not be the most well written or concise post that Ive ever made. With that stated I will try my best to paint the picture for all of you. For obvious reasons this is a throwaway account .

So about a year ago my boyfriend was sexually assaulted on a university function trip. The offender of the crime was a friend of my boyfriend who is also gay, and had expressed that he had feelings for my boyfriend many times. This person just so happened to be my boyfriend's roommate on said trip, and they were forced to share a bed. That night he and many other people that are in the same organization as him went out drinking, everyone was some level of inebriated including my boyfriend and his roommate. When they came back to the hotel and went to bed my boyfriend woke up shortly thereafter to find his roommate cuddling him with his hand down his pants groping him. He immediately was startled, embarrassed, scared, and all of the emotions that go along with a situation like this. He didn't tell anyone about it including me until he got home from the trip. He insisted that his roommate was simply drunk and was not thinking about what he was doing. He didn't want to deal with the embarrassment of saying something to anyone of authority about what happened to him. I immediately took issue with this approach, but we were still in the early phases of our relationship so i decided that it was not my place to tell him how to live his life.

Fast forward a few months to last summer and again this same organization goes on a trip and again the same thing happens. Same exact situation. He called me that night crying after it happened, I myself was out of town and so was he. I have never felt so helpless than I did that night, not able to comfort him, not able to protect him. All i could do was tell him that everything was going to be okay. Again he dint want to say anything because at the time he wasn't out as gay and he simply didnt want to be the source of drama.

After this happened he admitted to me that before he even met me this same person had sexually assaulted him inside a nightclub when he was drunk. Again it was only groping and no penetration or an effort to do so was ever made. So this has happened now on at least three separate occasions within the past year and I'm simply fed up with it.

I have no idea how to handle this, and really I'm not sure that there is any way to truly handle something like this correctly. We have no money for a legal process, obviously me hurting him wouldn't help anything, and beyond that im not sure what direction to turn.

In case anyone was wondering, this guy is still around and still very much a part of my boyfriends everyday life and I cant imagine it ever gets easy having to pretend that nothing is wrong. My only concern is my boyfriend and I just need to figure out how to handle this. Any advice on how to go about it would be greatly appreciated. Thanks.