Guys, If he's not interested why does he act like it?

I was seening a guy. I thought he was interested. He tended to look at me all the time, tried to get my attention, eavesdrop and repeated words I said. He also touched me a lot. He came over to me at parties and so on. But he never talked or did anything sexual.
But when I texted him he didn't seem interested. It was like I was texting another person. When I asked him out he always said that he was busy. When we finally made plans he flaked on me, he was busy. I had enough and unfriended him on Facebook. He texted me the next day but I'm not going to give him another chance.
What is this? Why was he acting like that?
Guys, If he's not interested why does he act like it?
Post Opinion