I blew my friend once and he won’t leave me alone, what do I do? /u/me-uh-ow Sex

Probably like a year ago, I gave a blowjob to a friend. He wanted it, I wanted it, good fun, no problems. But to me it was kind of a done deal after that. Didn’t really feel like giving him more after the first time, and we he eventually brought it up I made that clear. One time thing, no strings attached. Ever since then, he regularly brings it up, jokes about getting another one or just straight up asking me for one. I say no every time. It was a one time thing, don’t expect more. But he keeps asking, keeps making remarks. Hell I was with a girl I’m kinda into once, and he just came by and made a joke about the blowjob, in front of her. It was so embarrassing it was tough looking at her in the eyes after that. I’m just so over it, I don’t know how to make him stop his bullshit, all over oral from a year ago. What do I do?

edit: for those asking why I blew him in the first place, he wasn’t always obnoxious and disrespectful.

Probably like a year ago, I gave a blowjob to a friend. He wanted it, I wanted it, good fun, no problems. But to me it was kind of a done deal after that. Didn’t really feel like giving him more after the first time, and we he eventually brought it up I made that clear. One time thing, no strings attached. Ever since then, he regularly brings it up, jokes about getting another one or just straight up asking me for one. I say no every time. It was a one time thing, don’t expect more. But he keeps asking, keeps making remarks. Hell I was with a girl I’m kinda into once, and he just came by and made a joke about the blowjob, in front of her. It was so embarrassing it was tough looking at her in the eyes after that. I’m just so over it, I don’t know how to make him stop his bullshit, all over oral from a year ago. What do I do?

edit: for those asking why I blew him in the first place, he wasn’t always obnoxious and disrespectful.