Ex-Boyfriend Lying About Me

So I dated a guy for about a year and then we broke up and now i’m with someone else who treats me much better. However, today my ex boyfriends new girlfriend (who i’m kinda friends with) told me he told her he fingered me.. which never happened. He put his hand on the outside of my pants but he never fingered me and we never had sex. I don’t know what to do, i confronted him about it but he hasn’t responded yet. What do i do?