do I leave him?

Betrayal is such a roller coaster ride. You have to know it is okay to have a mix of emotions from being sad, mad and beyond angry. If the H doesn't want to hear it, then you probably won't be able to rebuild. Do you think you can trust your H again? Is he always jealous of your relationship with your daughter? You can try MC if you want to stay. If you are staying because you don't want to feel you made a mistake, think of the example you are setting for your daughter and grandchild. If you plan on leaving, see a lawyer first so you know what your rights are. Best of luck!