I’m kind of fascinated because of the difference in results between this poll and the discussions in this thread.
In my experience, love interests dating each other can be fairly controversial. But a very large swathe of players really hate love interests specifically rejecting the MC for another character.
I quite like both as a player for the reason that I like MCs not being the centre of the universe, but I admit that if I was really invested in a romance interest and they turned me down for someone else for reasons I didn’t understand, I’d feel a bit miffed.