What Guys Said 1
excuses=not interested anymore.
What Girls Said 1
How often do you text/call/talk to him? He sounds like a guy who's may think you are looking for more out of the "relationship," whatever it was. So he's avoiding you either 1. he really is busy, 2. he's scared you want more and isn't interested. OR he has a girlfriend or someone else he's seeing and doesn't want things to be awkward.