What's going on here?

Three years ago, I met someone thru a bunch of friends in college who wanted to hook us up because they thought we were a great fit. Landon and I didn't hit it off during that time & I actually ended up dating someone else. This past semester, Landon & I had a class toegther and we got close. However, this past summer, he kept the contact very often. We have great chemistry together and all, and I feel like he likes me just because well even a blind person could see it, we're so alike, he always goes out of his way for me etc etc. However, I'm not going to ask myself out, I feel like I've put myself out there enough and it should be him who needs to be a man and ask me out. I read that, "He's just not that into you book"! I took the author's advice of not asking myself out and if a man likes you he will do it. However, now Landon says that he likes this other girl and then also this other girl that he works with. Either he's doing that to make me jealous or he's fickle. It all started because one day I was looking at a guy, and I was looking at what he was wearing but not him! But Landon I guess thought I was checking the guy out, right there and then he started talking about the other girl. And now he asks me what to do and if he should ask her out after just talking to her for twice. What the hell? How did he go from being all over to this? This is why I never fall for anyone.