Possibly. If you were in carls shoes would you want to know? I wouldTheyve been together since grade school. You really think hes going to just believe OP over her? And even if he does believe Op doesnt mean he wont forgive his girl. And in that situation they will want her gone,or they will leave to avoid the akwardness. She is a reminder of the betrayl
Take out Weston and just lay a seed about the girlfriend. You never win that battle without proof.