i had the same problem with my son's father. he was young and immature and interested in video games than my son and i. when he decided to get involoved, he family helped him and he was a horrible dad. he would loose my son's medicine, stand him up & while my son run to the door eveytime he hear a car's horn. he would bring by son back with diaherah or ringwroms. (which takes 3 months to heal if in hair).
so when you say you want him in your child life be careful what you ask for.
my son is now 13y.o.
if your child father doesnt act right you can find another man who is willing to step up to the plate.
you cant put a gun to his head, he has to have a mind to do it himself.

For your childs sake. Try to keep the dad involved in your childs life. You all will be better for it.