Okay, so basically I'm one of those people who have a circle of friends who are all friends with each other. And almost a year ago, one of said friends (for discussion's sake, we will call this friend "Joe") got a girlfriend. At first we all thought this was great because she shared a lot of interests with the people in our group, and one of the ways we expand our circle is to let our friends' significant others partake in fun stuff with us. (In fact, I became part of the group because one friend's BF invited me to their gaming night. The rest is history.)
However, instead of being the cool person we thought she was going to be, she's turned out to be the textbook posterchild for an abusive partner, particularly for isolational abuse. Since late September of last year (when they started dating), Joe is seldom allowed to do anything with his friends or with anyone other than her. And when he does, she becomes a hurricane of jealous rage. To give you an example, he came over a few weeks ago to visit us, and because he wasn't on the computer constantly talking to her for those three days she plastered her FA account with 'vent art' about how unloved she was and proceeded to badger one of our friends on Facebook (who she had previous NEVER talked to btw) about a picture he posted from the three day party that featured Joe sitting with us all and making funny faces. Why was she upset? Because he was seated next to another friend of ours who happens to be female. However, according to Joe, she also freaks out if he jokingly holds hands with his male friends and skips around the college campus as well. Anyway, after the freak out over the picture, she later proceeded to badger Joe over skype as well (we all had our laptops so we could game together).
She expects him to be on the computer talking with her at all times, and whenever we invite him to game with us, she will often throw a fit about how we're taking him away. Threats will be made, and often he'll have to leave because otherwise she just won't stop. He also tried once to break up with her, but she threatened him with suicide, which forced him to stay with her, as he's the type of person who wants everyone to be happy, genuinely fears for others well-being, and is willing to sacrifice his own for theirs. However, the drain she puts on him is very noticeable, and slowly but surely we're hearing less and less from him because of his girlfriend making sure he has no friends other than her. He's admitted to us that he'd like to break up with her and doesn't love her, but he's clearly worried she's going to do something rash if he fully cuts the ties. He also doesn't want to believe that she's abusive, even though one of the people in our group who is very close to him was in a relationship identical to this and has tried to explain how and why mental abuse is still abuse.
None of us want to lose one of our good friends because his controlling girlfriend wants him to have no one in his life but her, but we're honestly backed into a corner. It's really hard to support someone or talk to them when you aren't even allowed to see them. I was hoping someone out there might have some advice for how to deal with this situation. =/
So the first step is there: he wants to break up. While I was reading your post I was already prepared to say "Don't worry, he's not gonna put up with that for much longer and will take care of it on his own" but, alas, as expected from someone who clearly has unresolved mental issues, she plays the typical "I'll kill myself" card.
As for the suicide threat, unless she already has suicidal tendencies to begin with, she's just saying that out of shock value to force him to stay with her. And it works, that's why she used it.
Ultimately, Joe just needs to go ahead with the breakup regardless of wether she plays the suicide card again (which she most likely will) or not. He could also get a restraining order, if necessary, either before or after the breakup.
And just in case she's not dramatic and is actually suicidal (which she might be, due to the ridiculously obsessive behavior you described), Joe should alert her family about it or even call 911 if necessary.
Not recognizing this as abusive behavior, though, could mean that he might fall for something like this again. When she's out of the picture and he's spending time with the group again, maybe suggest him a movie or a book about abusive relationships. He may think it's a dumb idea but he will undoubtely relate to it and hopefully learn a thing or two.
Hope that helps ~
He needs to get out that f this NOW before it gets worse, and trust me it will. Bitch be crazy and if he shows signs of leaving her behavior will escalate until he is trapped for life. She sounds like the type who would go so far as get herself pregnant to keep him in her claws. He needs help and he needs to get out.
collecting
Tell him the next time he goes to break up with her and she uses the suicide threat to call 911. Whether he thinks she's being serious or not, he should still call 911 to show her that he's not putting up with it.
She needs to grow up and stop being a spoiled brat. Hardly ready for a relationship. And yeah I agree with the above just call the police no one should have to put up with that. No common sense with her by the looks of it. Clearly she is unwell in the mind, insecure, jealous and selfish. Your friend wants to get far away from that. There isn't any helping them sorts of people other than telling them in black and white how it is and then blocking them from your life.