How Do I confront him!? 10 Easy Points?

He and I are GREAT friends. So one day he asked me out I was really happy and said Yes. The next day he dumped me saying This isn't going to work because some people on my dads side of the family is racist. ( Im black hes white) But today I found out from two friends that he was lieing. I know he like me and another girl. I asked him if there was any possible way for us to go out again and he said maybe. Basically How Do I ask him if he was lieing To me. Where should I do it ( we have homeroom, math, and language arts together)