It's been a great 125 chapters, but we've finally fallen into a stupid romcom drama trope. Today it's "Couple has to break up in order for one of them to follow their dream despite their dream not conflicting with the relationship in any way."
Like really, the only way I can see this being a problem is if they show the only way to make it in show business is to suck the right dicks, and this doesn't strike me as the kind of manga to pull a Cleaning Gal.