London Pride Cop Proposal ... No Happy Ending for Jilted Ex-BFs

Two guys who had to watch their ex-boyfriends' marriage proposal go viral ... are now crushing the dreams of Internet cupids, proving fairy tales do NOT come true, usually. Deal with it.

The guys, Matt and Jacob, became a thing on social media when they tweeted about the proposal that went down during London Pride.

If you missed it ... a London cop (Matt's ex-fiance) stopped in the middle of the parade, got down on one knee and asked his bf (Jacob's ex) to marry him. The proposal was shared more than 15 million times on Twitter, so Matt and Jacob quickly caught wind ... and couldn't resist tweeting.

Jacob and Matt tell us they were flooded with comments from people who thought it would be poetic justice if they got together -- but Matt says he has a new BF, so he's not looking.

They say they did exchange DMs, but simply to discuss their exes' engagement. Jacob says he'd be down to grab a pint with Matt, but that's it.