Orgasms

So I hooked up with this guy back in October and I figured it was just a one night stand type of thing, I got his number the next morning and I figured that would be the end. It's currently January and we still hook up on a halfway regular basis. He keeps asking me how to make me orgasm, I've only ever have 3 times and he's aware of this. I'm pretty comfortable in general with him at this point but for some reason I get nervous and act all shy when he asks how he can make me orgasm, it's not like it's anything that could be considered weird. So I don't know why I get like this. I just need some advice or tips on how to just tell him. Thanks ladies!! 💓