"If you break someone's heart and they still talk to you with the same excitement and respect, believe me they really love you." It's really dumb it takes breaking up to realize that though. And they don't deserve that.
That's when you'll know! So when they didn't come back, when you don't reunite, it's not meant to be and be happy it didn't work out because who you are meant to be with is still out there waiting for you! Don't rush, you'll find each other when the time is right, believe me, you will!