TJP, Happy Birthday! I know it's not the way that you wanted to spend your special day, but you have to keep your focus on you and your children.
The old saying that blood is thicker than water holds true especially when the mlcer tells his family what has transpired. However, the truth will win out and they will see what really happened, but it's not going to be for a very long time.
As others have pointed out, we all make mistakes, especially at the beginning. Pack up his things and put them in a room that you don't have to go into and when he comes over, he can take them. It helps many of us to put things away that remind us of them. This may be the case for you as well.
I'm very sorry that your children have been hurt by all of this. They are older and can see more of what is happening. Your h has a lot of life's lessons to learn and unfortunately, he's going to face the consequences of his actions as he blazes a path through mlc.
Just remember, you didn't break him, therefore you can't fix him. Keep the focus on you and your children. Allow God to have your h for a while to work on him.
I hope that you will do something special for yourself today.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.