Yeah, snooping...when its there in your face its hard to ignore, kind of like a plate of fresh baked cookies sitting in front of you and you're asked not to eat even one. But, no matter the temptation, the snooping always does more harm than good to the snoopee -- at least it did for me. It gave me more anxiety and who the crud needs more anxiety??
In regards to child support or any other payments he is suppose to be giving you monthly, I'd be in contact with a lawyer that way you don't have to have personal contact with him and heap more anxiety on yourself than is necessary.