ED horror!!!!!!!

I have been with my bf for almost a year now,every time we have sex he seems to lose his erection when we go for more than 10 minutes. I can't give him a blow job cause he doesn't like it and the one time I did give him one it was like I was just sucking on a soft sausage. I don't know how to talk to him about this matter cause I don't want to to hurt his man ego, what do I do,please help😭😭😭😔