Tbh I normally despise the inclusion of a love triangle but I think this is fine. We all know she doesn’t stand a chance and will probably only be here with the rival role for a few chapters, so her appearance will only be used to further the main character’s relationship. Progress in a romcom...
It still doesn’t make any sense.
Why would you not even tell him why you’re leaving? And taking ALL YOUR STUFF from your cohabitation place? The fact that he hasn’t thought of this as a break up is a straight up miracle
Dear people in relationships that you want to keep: This is a work of fiction, don’t actually just suddenly ghost your partner without giving them a reason why. It’s a pretty fucking terrible thing to do and it’s not gonna go as well as what will probably transpire in the story