Baby daddy issues?

A period is like taking a breath and by my count you only breathed once during that stream of consciousness. So first step, calm down, breathe, engage your brain and try to put your emotions aside. Regardless of your feelings for this guy your child has to be your top priority. He's failed you, which isn't unusual when people have kids before they have their lives on track. This doesn't mean he'll never get it together. A lot of people party through their early 20's then get their acts together later. You might hasten that by reporting his failure to pay child support because ideally he'd eventually be jailed and forced to clean up (to the degree he wants to as drugs are readily available in jail/prison). That might be the wake up call he needs. But outside of trying to reason with him and having him locked up you may just have to focus on your kid, not worry about what baby daddy is doing and hope that someday he pulls his head out of his orifice and realizes that he's got responsibilities.

Yes, some men regret not knowing their kids, but they're usually the type of men who wouldn't have ever left you anyways. It seems your ex is now on a path to his own death. He will end up dead in an alleyway soon, with his gambling and cocaine debts. It's best to get used to telling your son to forget about his father, he never existed. Sorry to be so harsh, but people with addictions never come back.

Usually that happens if a couple  gets married too early and one of the two get

bored with family lifestyle.  He might change in a year or two but I doubt it.

Kick his *** out and refuse all contact until he gets his life straightened out.

if hes doing drugs turn him in, and i would dump him too

Get a lawyer, take him to court. Get court ordered child support. that will cut down on his spending money. If he does not pay, he can go to jail.