<human>: Can you summarize the given text in a few sentences?

We were together for five years. I recently left him because he became less and less involved in my and my daughter's lives. He has become a heartless prick and the last straw was when he stood up our daughter on her birthday. When I asked him what the problem was he would completely ignore me, as if I didn't even exist. I am heartbroken and utterly devastated because I have no closure. Just a million questions as to why he has just given up on us and is willing to throw it all away so easily. Unless I find out why, I will resent him for this for the rest of my life. 

Our daughter will be "graduating" from kindergarten next month and I'm not sure if I should even tell him when it is. I'm 99.9999% sure he won't show up anyway and I have already told our daughter that he probably isn't coming. He won't even call. I'm afraid if I tell him, he will just think I'm trying to open up the lines of communication again, and that's really not what I'm trying to do. I gave him a million chances to be open and honest about what's going on and he's chosen not to take me up on it. There will be no million and one'th chance. But the other half of me is worried that if I don't tell him, and he finds out that I didn't try to let him know, that he will somehow try and turn it around on me and guilt me into feeling like I'm a bad person, because that is his MO. He's a real asshole but I want him there for our child's stepping up day. She's really excited and will be very upset if he doesn't show up even after I've told her he probably won't be there. We can sit on opposite sides of the room for all I care. He just needs to do the right thing by our girl.
<bot>: Just ended relationship of five years. Our kid is graduating and she wants him there. I know he probably won't go but I also feel obligated to at least tell him about it.