A guy I had sex with us telling people lies

I decided to take a chance and have sex with a guy over spring break. We all have the same friend group. Anyways he took me to hang out with him and his friends on a trip and I already knew we’re we’re gonna have sex because he talked about it. Things weren’t perfect during it but I know he was hard because I had to put it in for him because he couldn’t find the right hole. When we went back to school he started telling people he couldn’t get hard and that he cummed on my face, which NEVER happened. I was just wondering if anyone has any advice on what to do. He won’t talk to me unless he has to and we weren’t ever super close before. I’m 17 and he’s 18 so he has no reason to act immature.