Advice Needed!!

So my boyfriend and I have been together for a year and haven't had sex yet, he fingers me and I suck his dick but I have yet to make him cum from it. He's been super close to giving me orgasms but always quits right before and I don't know how to tell him not to stop because I don't want to be the only one of us to orgasm. I guess I need help with ideas to try something different or what??