Am I wrong?

I'm married to a church musician who has a regular full time day job. The problem comes in with his music gigs. For the past month my husband is gigging 5 to 6 nights a week including days on the weekends. We've had several discussions that have now become arguments about this. Lately he comes in later than normal...well after I'm asleep. Last night he came in at 2 am and another argument ensued. When I said I'm tired of arguing about the same thing, his exact words where "well where has that got you...no where". Today I left and I don't know if I'll go back. Something in me is telling me that he is cheating, but I don't want to believe it. What church stays in until 2 am...none.