making my boyfriend last longer

So i've been dating this amazing guy for almost a month now, and i took his virginity, our first time was really short because he was a virgin so I didn't really trip off it. But now everytime we have sex he cums in 5mins and it's kinda putting a strain on our sex life together because he knows he isn't pleasing me . And he also has a hard time keeping his rhythm when he is stroking. What can i do to help him last longer and keep a constant rhythm?