I need to heal

I recently found out my husband had been messaging other women on fb. We have decided to move forward and work on things for the sake of kids and with the understanding that this will not be tolerated again. How do you deal with the whole being in their phone aspect? I feel like a parent constantly asking what he’s doing but that just isn’t enough for me. My trust is at negative 100 right now. I know if I were to ask to see his phone he could easily just delete anything ( although I’m pretty positive he ain’t trying that shit again on me.) need advice on how to handle this situation. Please no hate comments and the “ why stay with him” comments. There is a lot that goes into why I’m still here and willing to work on things.