Wat should i do......help plz?

My ex is going out with one of my friends but I kinnda still like him...........I don't want 2 break up the beautiful relationship by telling her that I still like him, and I don't wnat to tell the guy that I stilllike him bc me and him are best friends now.......wat should i do?..................should i break them up on accident.......tell them i dont fell comfortable..............or just wait then tell him how i feel............. please hurry love crisist here!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!…