Anyone else have to go through this..?

I have known this guy since 05 and we had a child together but we broke up in 07 because he wanted space he was a good person until we broke up with me his so different now and He comes to see his daughter only 2 times a week he never calls to check up on her but when they are together he acts like he loves her to death but when he gets payed I have to ask him for money to get what she needs and that's $40 and that is not a lot to get her stuff with. and now she had a WIC appointment it was 10:00 and right at 10:00 he texts me and said im going to be late so he never shows now its 1:00 I cant get in touch with him or his mom cant Don't know whats going on. but anyone everyone thinks I should put him on child support I and my daughter live with my mom and my mom is pay-in bill his not helping and his daughter lives with my mom and I. I don't know what to do Im thinking about Child support. What do you think I should do??