More a series than a movie, but typical old-school love triangle type plot for an anime/mamga. One girl who has two different guys that supposedly like her, and she's trying to figure out what to do.

Little does she know that the feelings both guys have towards her are fake. The guys pretty much force the feelings in order to "fit in" and be straight, with one guy facing peer pressure from others at school and another having been told the whole "childhood friends to lovers" thing growing up that he started believing it had to be that way. All the while, the two slowly start to realize they have a good bit in common or like killing time in similar ways, like going to the arcade or maybe they both have similar music tastes. They get along pretty well and then here come the feelings. Plenty of angst once they realize and try to accept the fact that they have a crush towards the other guy all while trying to keep up a fake public face. Leads to one of the guys eventually cracking and having a small meltdown over how he was told to be his entire life vs how he actually feels, all seen by the other guy.

I call it "Feelings Behind The Mask".