They were childhood sweethearts and everyone thought they should be together, including them. So they fell in love, but they didn't know when the relationship changed. So they stopped loving each other and ended their relationship.
The meeting many years later was not as dramatic as imagined, just a plain "Long time no see", but who secretly rejoiced after turning around that they met again many years later, luckily it was not in a dream; and who understood the so-called love after meeting.
Fortunately, I met you again; fortunately, we are together again; fortunately, we did not miss each other.