What is with guys?

Why is it that when my SO and I fight or argue, or disagree, he sleeps like a log and I'm up all night upset? He gets up, goes to work, could give a shit! I'm up the next morning still pissed as hell! I don't get it! It's like men just care that much less! I wish I could Just not care! I wish it didn't matter to me whether this relationship worked or not! I wish I could freaking sleep through the misery! Ugh. Rant over.