Remember when you couldn't get your mind off having sex? That was your largest complaint. Now you are having sex 2-3 times a week! With that need filled, now you are having trust issues.
This is a problem that only you can resolve. She can try to reassure you, but IMHO....the more she has to reassure the more likely she will not see you being a strong, confident man. Tall order....trusting one who has betrayed you. Trust is like forgiveness.....or even love, it is a decision. You have to find this within yourself and don't continue to expect your W do something or say something to cause you to trust.
((hugs))
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!