My boyfriend is very passionate about a sport he is really good at. Since he doesn’t do this sport in the summer we spent nearly every day together during that time, but since the winter started this sport has been taking a lot of his time. 

I know that this is something he truly cares about and loves but I get filled with resent every time he says he’s leaving to do this, even when we’ve already been together for days. Does anybody have any advice on how to deal with this? I’m scared it’s ruining my relationship :(