Does it take courage to sustain a relationship?

Does it take courage to sustain a relationship thats the big question do it to me yes for an example this man named Jack and his girl named Cece and what happen to Jack and Cece they had got in a fight and Jack did not want to break up so then 5 days later Jack seen Cece with an nother boy when he was going over her house and Cece and the boy your having sex and when Jack seen that he got mad and wanted to kill them both so then Jack had broke up with her and things were good again but thats what think untill he caught them again and it was all hell and Jack was mad at her but then he had taking her back again and 2 days later he got an text message and it said its over from Cece so thats what I mean when you need caurage in a relationship to keep it alive.