Yes, focus on today and your children. They must be your priorty, they are innocent victims of this maddness.
This will get worse before it gets better, what is your plan if he comes over again...are you ready to keep him out?
He has been an addict for a very long time, there are no magic cures, and he is not seeking recovery...you must protect yourself and your children.
You cannot help him, only he can help him. Taking him back all the time, just fuels the addiction. Perhaps if you let him fall to his knees, he will seek recovery. He is responsible for him, you are responsible for you.
I know you are hurting, but, you need to think with your head, not your heart. Easier said than done, it is a slow process.
I care, please take care of you and the little ones.