A lot of men cant easily talk about their feelings I wouldnt try to push him into too much of a corner theres been much speculation here if hes a bus driver for example he might not be 12 hours driving but could be 12 hours or more away
Perhaps he had a momentary doughbt brought about by who knows what perhaps hes ashamed of it and is unsure how to talk about this the core question for you is do you still want/trust him
If he is back to his usual self you will recognise this I think after so long together if not then as I said use your own self worth to decide what to do
Good Luck
