i like my ex, what should i do?

we hangout all the time, like every other day. We flirt 24/7, and everyone says he acts like he likes me. He's always randomly texting me, and when i'm with him he always steals my cell phone and changes my facebook status to " i love _____", "_______ is soo hot" "i love _______ soooo much", or commenting on his own status via my profile, and commenting " i love you", " i love you so much" "hey babe" and " i love you babe". Everyone thinks we're dating, thats how much we flirt and how much we act like we're dating. I really want to date him again, we broke up over a fight, we dated for two months. What should i do? should i pretend i don't like him? should i tell him? if so, how should i do it?