My boyfriend doesn't last long in bed

My boyfriend and I have been having sex for months now and he cums within the first 5-10 minutes every time. I never want to be demeaning or hurtful about this topic but it's really starting to bother me because once he cums he automatically stops trying to get me to cum as well. This results in me almost never getting an orgasm because the sex is over so quickly. I've tried talking I him about it but nothing seems to be changing. Help! What should I do?