A sad thing about life is when you meet someone and fall in love, only to find out in the end that it was never meant to be and that you have wasted years on someone who wasn't worth it.
人生最傷心的事,是你和他/她愛情長跑了多年,最後的結局卻不如所望。
If he isn't worth it now he's not going to be worth it a year or 10 years from now.