New here and trying to deal with my stbx

Sorry this is probably going to be long but I really need some advice about my stbx. Background.... I have not seen him since February of 2007 when I joined the military(he was already in the military and stationed elsewhere). This was also the last time he saw or spoke to our daughter(and my son) since they stayed with my parents while I was gone. When I was at training I got my one phone call and he informed me he wanted an open marriage. I disagreed and he said he wanted a divorce. Couple months later when I was out of training he wanted to work things out and I agreed until I found his myspace and saw that he was carrying on a relationship with a woman where he is located. I told him I wanted a divorce and he finally agreed.

Fast forward to now...we are in the midst of divorcing and the last couple times I have talked to him it has turned into a fight. He has not attempted to call his daughter since Feb. of 07. He has not contributed any money for her care in that time as well. Which actually doesn't even bother me anymore. I'm used to it. Getting on with this...lately he has progressed to what I guess would be considered verbal abuse. It started with him messaging me on myspace. Calling me a sl** and saying I was going to concerts to pick up men. I talked to him on the phone yesterday evening and asked him to please stop talking to me like that. Yes I know I should of let it go but it was one of those not thinking times. I could tell he had been drinking and our conversation quickly deteriorated into him calling me every name in the book.

He accused me of having a sexual relationship with my roommate(who is like a sister to me and knows our daughter better than he does) and that I was an army sl**. After saying all of this he then started being nice to me. Telling me he would always love me. Then it went back to calling me names. Then it turned to let's give our marriage another shot. I'll move down there and we will work it out. There is no chance of this happening. I've explained to him that I like him as a friend...but I do not love him and we will not be getting back together. Plus he has a girlfriend!

What can I do? At this point I am emotionally drained from our conversation. It was like a never ending rollercoaster. I tried getting off the phone saying I was tired and he just kept talking. I didn't want to hang up because that would only anger him more. The only time he calls is to start trouble with me. He never calls to speak to our daughter. I've been told to block his number but I don't feel that this is right considering we do have a child together.

How can I handle this? I'm so tired of having to defend myself to him and I wish he would just move on with his life.