some men

Why do some men act like they love their kids with all their hearts but when they are supposed to have them they don't. They would rather play video games or spend time with their friends then see their kids.. I hate that.. I have two daughters and I share custody with their father but on his days instead of taking them to do things or them staying at his house, they are always at his parents house and a lot of the time he doesn't see them. I'm not even sure if he calls to talk to them. I really don't know what to do about it. I always wanted their father in their lives because mine wasn't around and it sucked. I don't want my girls to grow up hating their father the way that I grew up hating mine. I love him now always have but I had a resentment towards him and that wasn't a good thing for me.... I don't want my girls the way that I was.