Hidden Penis

I have recently started dating a new guy, we have been on dates and yesterday he came over and we ended up having sex. I didn't even see his penis at all, even though I was naked and on full display. He started out with his boxers on and slipping the condom on under those, then proceeded to get on top of me and take them off so I wasn't able to see anything. Even when we changed positions his shirt ended up covering his penis and I wasn't able to see anything. And when he finished it wasn't anything that made me believe he actually finished like no sounds or movements that gave me a clue until he said "I'm sorry that's the end of me, do you want me to do something to help you finish?". When he got up he had his penis covered with his hands and when I asked why he was hiding he basically said that he hadn't done this (as in sex) for a while so there was a lot of cum and it made the condom sag and look weird so he didn't want me to see, then proceeded to grab his boxers and go to the bathroom. I don't even know what happened or why he was so quick to hide his penis or keep it covered. It definitely wasn't small from what I felt, so I don't understand why he wanted to cover it up? Any advice on what to do? Should I ask him what was wrong? Why did he want to keep it hidden so bad?