There's a trap door somewhere.

I finally got in contact with one of my close friends (although he lives an ocean away) because we had lost touch. And by this I mean he was completely gone from all of my contact lists. Facebook. Skype. deviantART. He wouldn't return my texts or my emails. Finally I found him on dA and I sent him a message asking him why he wouldn't respond. Today he finally responded and we got caught up with each other. He told me the reason he couldn't respond is because his girlfriend won't let him talk to other girls, especially girls who are close to him as I am. He told me that his girlfriend tells him he's the worst thing that ever walked on this planet and how if he leaves her she'll kill herself. She abuses herself and him. His friends know about it but they aren't the kind of people to take action and his parents only know part of the story but know that there is something not right with her. Being a victim in an abusive relationship he has no idea how to get out of it. All I can recall is those videos we watched in health and how similar this is and it scares me so much to see him in this situation. I told him that the only way out it to go to counseling or some kind of relationship therapy or a group. He dropped out of college because she has taken so much out of him. I don't want him to suffer like this. I'm trying all I can to help him. He was supposed to visit this month and I was counting down to it but since he's no longer in school, he can't go on the trip. I don't want his girlfriend to find out that I'm talking to him so I'm only communicating via dA messages. He's one of the greatest, most caring and compassionate friends that anyone could have and that's probably why he's in this situation. He doesn't even love her now. In fact he hates her but he still could never see her get hurt. He wants help for her. If anyone can give me advice on how to handle this situation, please please please help me! I don't want to lose my best friend.