What do I do???

So my boyfriend and I have been having sex for a couple months now and on occasion it's great, but most of the time it isn't great. It's awful. He can't get or stay hard. Ever. And worse, he acts like it's completely normal and has never mentioned it at all and when I hinted that I could try to help him when that happens he assured me it wasn't normal and that it was only because he was tired or thinking about other things- which must be happening every single time because he's never hard. I had to give him a blowjob for 20minutes to get him hard once and if he was that hard every time we could have wonderful sex but we don't because instead I'm getting poked with a floppy little soft penis and I'm losing my mind with the constant disappointment! I'm afraid to bring it up because he never mentions it. I'm questioning whether or not he understands that most men get erections not have sex with a completely flaccid retreating penis. It's practically withdrawing back into his body whenever we actually have sex. Do I bring it up? How do I bring it up? When? Because i cannot keep doing this 😩