Do I have a right to be mad ? & what should i do from here ?

There's this guy & me have been talking more than friends for months now . But we haven't made anything official .... but he wanted to get in a relationship & all of that . But we decided to wait i guess ,. But yesterday i was on his Facebook . & he was talking to some girl calling her sexy & all of that & she called him babe ... & allot of stuff . & they were flirting like me & him dooo . & ugh i feel stupid again . because last time me & him took a long break where we weren't talking because i found out he was talking too me with a girlfriend. So i cut him off . & he came back to me a month later apologizing ... & he explained the whole thing .. so i took him back . i feel like i made a mistake .