he doesnt have a phone or computer and is never "late" from work so hes not cheating im 100% sure but we used to do it every night now its once or twice a month i ask him constantly why he doesnt want to and he always says "i do just not now" he still always wants to cuddle and be close just not have sex should i be worried? he turns 23 next month he should be in his prime.... im terribly worried