Dutch (from rdr1) knows that the only thing he has left of his old life, the one he loved so much, is you. So he's become extremely possessive. While forming his band with Native Americans, he notices some of them checking you out. So he becomes enraged with jealousy and makes sure to let everyone know that you're his woman, and no one else's but his.

Inspired by Lana del Rey's 'Religion' song. The whole song fits together in part, but I'd like to quote the following part:

"'Cause you're my religion
You're how I'm living
When all my friends say I should take some space
Well I can't envision, that for a minute
When I'm down on my knees, you're how I pray
Hallelujah I need your love"