Pixel42
Schrödinger's cat
Look, Zelensky wasn't particularly brave.
He believed that NATO, i.e. the USA and Europe had his back, but they never seriously did. So instead of giving up a couple of territories where the majority of the population would rather belong to Russia than to Ukraine, he expected the help from the powers that he thought were his allies, but they never intended to seriously get into a real war with Russia. Instead, they gave Ukraine just enough weapons to be able to let the war continue with no end in sight, much like what happened when Russia invaded Afghanistan back in the 1970s and 1980s.
As I recall it was the USA and European countries that responded to the invasion by offering Zelensky and his government safe haven, so even if he'd expected them to "have his back" before the event he would have been quickly disabused of that notion. When he declined those offers the general expectation was that he would be dead within a couple of weeks; that's how long most commentators thought it would take for Russia to capture Kyiv, shoot him and install a puppet government. It was only when it became apparent that, amazingly, that was not going to happen that any western countries started to consider whether helping him might be the right thing to do.