Why Can't My Baby Daddy Step Up and Be a Father?

Dumb of me to ever think that maybe after my pregnancy or after having my son ! My baby daddy would change.. i guess i was wrong im just going to have to understand that we’re not meant to be and maybe he’s just not ready to be a father ‘ i thank his mom for stepping in for him and doing what her son doesn’t do like buy him diapers , gives me money for my son and so on , i don’t want to sound ungrateful because i am not but i feel that as a mother she should encourage her son to do the right things but i am noone to judge to the way others raise their kids all i can say is that in the end it’s only going to hurt him when he sees that my son is getting older and ends up not knowing who he is , 🤷‍♀️ everything is this way because of him as a mother i am doing what im supposed to i wish guys understood that their doesn’t have to be a relationship with the mother of your child for you to step in and be their for your kid its all about being a father if you laid down and made a kid why can’t you be their for him? BUT He’s young one day he’ll understand not by anyone telling him anything but by tough battles and experiences life will throw at him .