Did he just lose interest?

A couple years ago their was this guy I liked. We just had some fun together sometimes… kissing and me giving him a blowjob was the extent of it. I did get emotionally invested in him though as I found it hard back then to seperate our physical time from the undeniable feelings I was starting to feel for him. It took awhile… but I finally started not to think about him anymore… that was until a couple weeks ago when I ran into him at a store! I actually went and talked to him and gave him a hug. He was saying that we should hang out this summer and it would be good… I’m like yeh totally not thinking. I didn’t really have his number anymore so I msn’ed him a week later… I debated whether to contact him but I decided to just take that initiative. I said in the offline msn msg that it was nice to run into him and that we should get together sometime. Next time when he saw me online he said he was into getting together and for me to just tell him my availability. But that was like 2-3 weeks ago and he hasn’t sent me a msg since. What’s the deal? I mean I just wanted to get together and see where it led… maybe a fling, maybe not.. but what guy doesn’t jump at that opportunity when a girl is practically inviting him by taking the initiative to make contact? It just bothers me and I’m lonely, horny, and agitated because of this situation. I was doing fine until I saw him again the store and just seeing him again brought up so many memories of him in the past and is making me fall for him again.