Did he have an addiction when you first met him?
There really isn’t anything you can do for him as he needs to want to sort himself out for himself. I’ve seen this time and time again where peoples lives are destroyed by drugs, and poor family members suffer tremendously. I’m sorry you’re feeling this way, but a life with a crack user is no picnic, and it will destroy you eventually.
If he isn’t willing to get the help he needs then you’re going to need to leave and safeguard your children.
Crack addiction is powerful and he would need a lot of determination to get thru this, however at the moment he doesn’t seem willing.
Please don’t walk the streets looking for him as that’s so dangerous, and you don’t know who and what you will bump into. For example, what if he owes a dealer money? What if then they follow you home? Maybe he goes away from the home so that that life don’t impact on your family!
As heartbreaking as it sounds you have to put you and the kids first now and prepare yourself for changes.
Big hugs