Me and my ex still act like we are together. What should I do?

Me and my ex have been together on and off for the last three years. Nine months ago I dumped him because I found some emails blah blah blah he denied it and he also put off telling me he was taking a trip to visit his first love for a week. He didn't tell me until like two weeks before he was supposed to leave. But anyways.

He still comes from L.A to visit it me, When he is here we kiss, cuddle, hug, hold hands, have sex, go out places, say we love each other. all of it. but we are not together.

I love him so much and I know he loves me but... He is the only serious relationship I've had so I think that's why I cling to him.

I want a new guy. I want to see what other people are like but at the same time I don't want to loose him. He treats me great but I can't get over the things he's done to me in the past. He plays WoW 24/7 He dumped me to meet some chick he met in WoW. He put up a craigslist ad for a girlfriend then instantly deleted it when he found out I knew about it. He's put me through hell and back.

The thing is I know he loves me though.

I don't know what I should do.
Me and my ex still act like we are together. What should I do?
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