Lyric discussion by Fighter 

Cover art for Inside Out lyrics by Five Finger Death Punch

Woman left him and naturally he has been brooding over what he did wrong. He came to realisation that she never cared and it's exactly as simple as he suspected, because:

"You can love it or you can leave it"

He is hurt, but he refuses to give her satisfaction. Women only have control, because it is given to them by men.

My Interpretation