You can get yourself into quite a psychological rut over this, you feel like a failure, inadequate, not man enough etc etc. And all of those negative emotions just hit you each time you have sex, and obviously all of that emotional baggage is basically shooting you in the foot, it's a vicious circle. He just needs to relax, not push himself about it, have a few sucessful sack sessions and build his confidence.

Given the fact that you've been going out for 12 months but only been sexually active for six weeks means that you're young and not that experienced? It's relatively normal in that case.

Just don't worry about it, and try not to let him blow it into to big of a deal, but likewise don't belittle the way he feels about it.