Is it normal i don't understand his mixed signals????

Hi, (sorry this is kindda long)
I was set up by my friend to go out with this guy (an acquaintance). He bugged my friend to set it up until she did. It was instant chemistry. We went out a few times after that, talked or texted every day. It was a bit intense. He was sweet, and always on top of what I was up too etc. About a month later I have a wedding with mutual friends and invite him. he does not confirm and ultimately doesn't go. He dissapears for a couple of days. Reappears the night of the wedding. Texts, flirts etc. writes to another friend to take care of me and report to him about me. Next day: he's back with his ex. Apparently she found out about us and called him up (I don't know the details on that), I found out they were back through facebook), obviously devasted. He erased me from blackberry and fb (we believe the ex had something to do with this). Anyways, they ended up breaking up twice in 4 months. On the fifth month I'm out with the friend that hooked us up and he calls that he is coming to meet us and she says no. Then we see him in a party and he starts talking to her of how great I am etc. I just greeted him and continued my path. A couple of weeks after that Im out with a coworker of his and they are bbm of some work thing and it slips that I'm with her. His comment is that he guesses he can't come because Im there (btw, not the first time this comment has been made) she says its past history and he basically makes her give him my pin in order to prove it. We've been talking ever since (two months now)as if nothing ever happened. We've gone out twice, talk or bbm almost every day. Flirt, when we get together he is so attentive, always hugging and coming on to me. Because of the past I cant let my boundaries down. he writes when he's out of the country, tells me where he is or what he's doing. Great right? Through all of this we havent really had the talk of what happened before and where we are etc. Here is what I dont get: last week we were both flying out to the same city. He with his friends and I with mine. the week before that he incessantly commented that we were leaving, how great it was going to be etc. the day before leaving he asks me how he can reach me there. he wishes me a good flight on the morning i leave and tells me when he got in. In the afternoon asks what we (my friends and I) are up to, at night does the same thing but unfortunetely that day we couldnt meet up cause we got out late from where we were. Next day is the concert and he completely disapears. When he reappears during the weekend he makes it as if I was the one who dissapeared, and then I find out that he went clubbing with his friends and women. I never responded to his bbm. when we were both back I sent an unrelated broadcast and he immediately reponded.
It is obvious he is into me but at the same time he is so distant and Im sick of playing this game but Im really into him too. Any advice? THANKS!