He is strict abt everything included. Like..: he doesnt let her talk mean, specially curse. He doesnt lets her acts bratty, talk abt her ex or do anything without telling him, calling him "dude, buddy". He hates when she talks with other guys he doesnt know, etc.

A midnight: they were watching horror movie. Jumpscare comes suddenly and she suddenly says "Fuck-"

"Dont u dare.."

he glares at her dissapointed and mad look