Why did ou guitarist leave?

So I have a band (I'm the bassist) and we were looking for a guitarist. So we found this very good guitar player he's aloso a teacher and he's our singer friend. So we decided to do a jam sesession in his house including me him and the singer (the drummer was not available) . And so we jam for 4 hours straight we had so much fun and he also liked everything that I was playing he was constantly say :I love that can you repeat that eccetera. .) but unfortunately the next day he called the singer and said to her sorry i can't join thè band because I didn't feel the alchemy but if you want we can do another jam session lol. That literally chocked me because we had so much fun and aloso how can he say that without having a real jam session with the drummer in a real studio how can hè be so impulsive in he's dessicion anyways he really desipointed me.

Sorry for my bad English it's not my first language ^^.

Why did ou guitarist leave?
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