it proves that you’re mature enough to stay friends. just because the relationship failed doesn’t mean the friendship should. i mean, it all started from friendship after all. it’s nice seeing two people who used to be couples manage to stay friends, or even bestfriends after the breakup.
And maybe things never change. They stay the same. Messing around and telling jokes like they used to. Or even being able to continue conversations like nothing went wrong. Staying friends after a breakup is the best way to prove that you’ve moved on.