Simpship

Like friendship where the feeling is mutual and reciprocated, but instead of being just each other's friends they simp for each other. This includes, but definitely not limited to: putting one on a pedestal as though they are the mere embodiment of perfection, constantly complimenting each other, always talking to each other, talking about the most boring stuff that you two still can't help but find interesting, whereas anyone else would've long been asleep if you had the same conversation with them, telling utterly pointless stories from your lives, telling secrets to them that you took a personal and seldom oath to yourself to never tell, etc.

If you feel that you have a relationship that is reminiscent of the aforementioned, you're made for each other. Ask them out.