The ml could be an ass who forgot how his fiancé look like, but I think he has Prosopagnosia ?? I mean no matter how you hate your partner or don't give them enough attention no way you wouldn't recognize them just because they changed their hair style lol
And maybe that's why he told her the old hair style is good on her because she's the only one who waers it
But again maybe he's just an asshole so..
But I'm back with every notification to check the comments... Just to see if Isaac is back or not