Second Girlfriend?

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I am 20, I have this guy and he's 22. We meet in a social networking site because of his girlfriend Miss L.She introduced his boyfriend through that website and I told her that i would add up he's boyfriend to be my friend also,I just wanted to be her boyfriend's friend and nothing more than that. One day when I checked my account I have found a friend request and it was HIM. I hesitated to add him, I even said "Why should I?" and then i thought "Why not?" he didn't do something wrong so i confirmed him. I was online every morning and so he did, he chatted me and said his intro "HI" then I said hello back then we talked nonsense but we enjoyed talking to each other.And one morning I received a text message and it says "HI" and the first person that came to my mind is him. I immediately checked my account and checked if he was there, then i chatted him and asked "How did u get my number?" he told me it was written in my information in my account. Then we were texting each other everyday and one day he told me that he fell for me, he's no longer in love with his girlfriend then asked me if i can be his girl but i told him i won't because, he has a girlfriend. But he promised me he will settle it as soon as possible. But she's my friend and i love him also. Still i accept his deal until we reached our 5th monthsary still they're together. he told me that Miss L is Blackmailing him that if he would leave her she'll commit suicide. And her family also are blackmailing him that whatever happened to Miss L he will be the one responsible. He can't get rid of her so I told him that i would give way so i break up with him many times for the same reason. I break up with him maybe 30 times already, but still he kept on coming back. What can I do? I do really love him also so I keep on staying with him he even committed suicide because of me. I'm afraid every broke up i made he did stupid things and he kept on blaming me for that.I admit my mistakes and I love him but he can't get rid with his girlfriend.His brothers sometimes get mad at me because I'm always hurting him. I have my reasons for doing that and they don't understand my situation. A second choice? That's what I've thought, but i can feel his love, his care the only problem is he's not brave enough to fight for me. One thing, the other reason why he can't get rid of her is because he was the one who broke Miss L's virginity. What shall I do? or He should do to make our relationship work with peace of mind? or shall I give up or still fight for my love for him? Please I need advice..