CANT CUM ??

So I have been with my super sweet, sexy, adorable, lovable, perfect boyfriend for almost a month. I know it’s not long but we’re crazy about each other so we have done a lot. We’ve given each other oral and handsy stuff and had sex once. I didn’t cum from the sex obvi because it was my first time but other than maybe the second time, I can’t get off from him rubbing or licking my clit!!! It’s good for a while then it gets numb!! And it goes away so fast! Could it be too wet or too much spit? Or maybe the meds I’m on? I’m so frustrated