Love-Struck?

A childhood friend which soon died off and left us as strangers. Several years passed and we’ve started to talk casually towards eachother, not in person but online. He’s four years older than I am but his actions are based on his inner-kid. I’ve started to grow an affection for him; from the knowledge as a child as to now.

Can it be that men are naturally flirtaous? haha.
or Im I casing a lost cause? He is always suggesting to visit or come over but Im always busy with my time and is free when he’s not.