Any idea why he cut it off?

Had 2 dates with a guy & we seem to get on well, we were making plans for the following weekend, then he goes quiet & then texts me he feels we aren't suited.

Yes i know it may be as simple as he does feel we aren't suited or he's met someone else but there didn't seem to be any warning or any signs on my part that we weren't suited.... he won't tell me why he feels we aren't suited but any ideas why he just cut it off?