Wedding (2017)

Both are about a man loving his friend but it’s not reciprocated. In the end, he has to see the one he love marry someone else.

Both of these films revolve around a gay/lesbian main character reflecting on their unrequited love for their best friend as their friend gets ready for their wedding day.

Unrequited love between two best friends, where one has a girlfriend.
The two films also have similar vibes, with a really depressing atmosphere.