Trust is so hard to rebuild, but it gets easier as time goes on. If H wants to rebuild the trust, maybe he should volunteer his cell phone bill for you to see and possibly be more accountable to you about his time.
I still think about W`s A every single day. We never talk about it anymore and I never question her about it anymore and I finally stopped snooping. Things get better and better every day, and I think about it less and less as time goes on, but the thoughts always seem to creep into my head even though I know that I have my W back and that things are and will be fine with us.