Cheating/Porn/Neither

Ok I need help and long story. When my husband and I first got married, we were having sex like crazy! (Sorry, TMI) lol. The further into our marriage we get, 3 years in now, he wants it less and less. I always want it, we are 21, and it was also prepregnancy so not the causes. I've talked to him multiple times about it. He just says he is tired and hurt from work (it's very physically demanding). I tell him I feel rejected and unattractive when I try to start it and he turns me down or that I always have to initiate. He apologizes, it gets better for a week or so then goes back to like twice a month -.- our sex isn't routine, we try and mix it up so it can't be boredom either. I even offer oral but he just says he's tired or stressed. You don't do anything in oral and cumming is stress relieving!!! I don't understand! He has really crazy hours for work where he comes and goes at all sorts of different times. (TMI again) he poops for a minimum of 30 mins if not longer! Says he's always been that way and doctors don't know why but I feel like he's probably watching porn instead. Locks the door and has phone every time but not when he pees. He's never done anything to make me not trust him. So does he work crazy hrs and have a jacked up stomach? Cheating? Watching porn? I trust and love him but I don't want to be naive either. Help!

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