Hopelessly in Love

It's been five years since you've met them. They've been there for you throughout life, it's a usual comfort. But... that usual comfort has become more intimate to you. Especially to you. Everytime they laugh or interact with you in any way makes your heart race like it's first place in a racing game, your stomach tightens like a knot holding a sail together, and makes you more elated than a balloon filled with helium. You have a crush on your best friend. There's a problem with this though. They have a partner and y'know what's worse? They've been dating for a year and they seem really happy together. How will you tell them? Can you? Will you? Or will you forever be hopelessly in love with them?