ESB era Luke is in love with Han, but thinks Han is in love with Leia.
Not wanting to get in the way of Han's happiness he tries to move on and ends up dating another Rebel guy (cannon or omc) .
However the guy treats Luke like complete crap (shoves him around, makes degrading comments, cheats on him).
It started out good, but then the guy started showing who he really was, and by that time Luke had started distancing himself from Han and Leia (because it hurt/the guy was jealous) and after having lost so many people he didn't want to loose someone else he thought cared about him.
Han, who really was in love with Luke, notices how the guy is treating Luke and does something about it.
???/Luke, Luke/Han, Abuse
Not wanting to get in the way of Han's happiness he tries to move on and ends up dating another Rebel guy (cannon or omc) .
However the guy treats Luke like complete crap (shoves him around, makes degrading comments, cheats on him).
It started out good, but then the guy started showing who he really was, and by that time Luke had started distancing himself from Han and Leia (because it hurt/the guy was jealous) and after having lost so many people he didn't want to loose someone else he thought cared about him.
Han, who really was in love with Luke, notices how the guy is treating Luke and does something about it.