VERY LONG STORY. Why would he lie like this? Is there more to it?

If i were you I would follow my gut instinct. You think he is lying to you and has more going on, then you are probably right. But it is not normal the way they have been going about it, I mean he should include you in there with her and from the sound of it he has not been. I mean come on, wanting to hang out with a girl that he thinks those things about. Don't you think it is funny they have such close friendship so fast and really did not include you in it. You are his GF but sounds like he has things going on that he is keeping from you.