MC is a bit relatable in that many people I know keep their bf/gf in a "special" category where they only show a part of themselves. It can be jealous-inducing to see their "family only" faces that they never show you, or god forbid they have some pseudo older brother/sister/dad/mom figure that they claim is platonic and looks anything but.
there's also the flipside type which is super nice to everyone else and treats you horribly because "we're close so I don't need to keep up a front." this type is likely to never try to take the trouble to look nice for you after a while.