my boyfriend cums too fast

hi so i just started dating this guy and we weren't virgins but we also weren't experienced, and when we have sex he always justs cums so fast like not even 5minutes into it and he cums and then he's tired and doesn't want more and i just lay there like ugh.. i've also never had an orgasm before and probably never will because he just ends it so fast.. will it get better with time or no? what can i do? and i also don't want to make him uncomfortable