Trust after cheating

Olga

My sister once said if you choose to take him back after cheating you can’t bring it up again.

So if I take him Back after cheating can I check his phone or question him about where he is or who he is with

We been fighting about that. He wants us to move forward and says I do t get over the past. He feels like nothing is enough for me now. but I feel like I need to earn trust back and I don’t think he is doing it.

How do you earn trust back? What the right and wrong things to do as a woman and man when you decide to stay together after infidelity?