I have feelings 4 my ex again!?

I, ME broke up with mi bf because I was told by 10 DIFFRENT PEOPLE that he was cheating on me. They said at the library(the TRUE hangout in the heights) tey saw him with a girl in his lap and the were touching.Also i wasn't felling US anymore. Now I feel him or US again. It was mi fault that we broke up but what should I do to express mi feelings and not TOTALLY EMABARESS MYSELF! We are friends still and we kinda walk home together on Tuesdays, what should I do?????????????????????????