I have been apart with my ex for 7 months now, we always kept contact over mail and cam (long distance relationship). For those who want more information, I wrote a thread before.
In short, he is seeing a girl, we fought because of it, then there were two weeks of no contact. After he calmed down, I talked to him and asked him if I can visit for his b-day. Surprisingly he agreed to it. He even paid the plane tickets and I will fly over to him in a few weeks and stay there for a month. He said that he will have to call it off soon with this girl, because it is not leading anywhere. Then again he said that it is so easy with her, she doesn't ask much of his time, didn't need to be added in chats or social sites, and they keep contact just over phone (send each other texts from time to time). I know he is still attached to me, he tells me how excited he is to see me, how it makes him happy to see my smile and we can talk normally again. On the other side, what I don't understand is why he is still seeing this girl. I mean he wanted to call it off, and he even said that he doesn't feel like seeing anyone he doesn't already know for a long time. (He knows her for a few weeks now). But she stays the whole weekend at his place. Before he described their relationship as "nothing serious". I don't think he is the guy who would want to sleep with other women and then with me. There must be some reason for her staying over the whole weekend. He broke up with me over cam, while he doesn't want to call things off over phone with her.
Anyone having ideas on why he is behaving this way?

Additional details:
He keeps pointing out that my visit has nothing to do with us coming back together again. That I only visit because it is cool to hang out together and so on. He also used to decline my visit before with the excuse that it won' be the best for me, but after I said that I can't decide that myself, he told me that he is also worried about himself. This means he is scared that I will get angry, sad and annoy him again in case things go wrong while I visit, or because he won't want to be back together with me.

Sounds like he's a lady's man... and he just wants to hang out and have a little fun with you, if you know what I mean... he wants to experience what it is to be with the girl he would like to have a commitment with compared to the girl who he likes to have flings with since she visits on weekends... thats how I see it...

But I doubt he is this kind of a guy. He never cheated on me during our relationship. He also wouldn't let me fly over across the whole continent just for sex, since he can have it there with this other girl. Before he even suggested for me to stay for 3 months.

Does anyone else have a different opinion it?