Confused!!

Taylor
So I'm with my boyfriend of several months and sex was recently brought to the table. The first time we had sex, after he put the condom on he went soft. So I had to do everything over again to get him back up, and same thing happened during he went soft again. I excused it as nerves cause I was nervous too.
But the second time, the same thing happened again. Is it still nerves or does it have something to do with the  condoms??