A.W.
Is he stressed out? My guy is so the opposite I can't even imagine. Is there something else that is bothering him, has he put on weight? Try to get him to communicate about it when it's not "the moment", you know. Maybe he is feeling pressure to preform after it's been awhile or afraid he won't satisfy you? Analize the rest of your relationship and make sure that there is nothing else wrong. Good Luck.