If he thinks this is a good way to get your attention. He is seriously wrong. It honestly sounds like he has problems beyond your control. I was in a bad relationship and it hurt me deeply because I stayed, I wouldnt catch the warning signs of him being bad. If he's trying to kill himself you either need to call his parents or call 911 and get someone over there. It's very serious because you could wake up one day and he would be gone. I really think that if you have feelings for him you should do this and that you shouldnt get back with him unless he has changed or said he wanted you back. He needs help and he's trying to ask you for it in his own way. No matter how he reacts to what you do just remember your saving his life.