I've been cheated on and still don't know what to do!

I was with my boyfriend for a "year" he cheated on me a week before our anniversary. I found from he's best friend sending me a text after the break up. We started talking again about 6 weeks after the breakup. We makeout like crazy eveytime we're together but he flirts with girls on his myspace. So I dunoo if he's playing me again. We never had a serious talk, I'm waiting til the day we do talk to see wut my next move will be. I don't recommend waiting, it hurts so much more.