Let me share with you a story i heard:
A long time ago, there was a scholar who was very heartbroken cos the girl he loves very much was getting married to another man..

He was very sad that he lost all his hopes in life,

Suddenly, a monk walked up to him and passed him a mirror and asked him to looked into the mirror,
So he looked into the mirror...

In the mirror, he saw a dead girl and he was wondering who the girl was...
When a man appeared and saw the dead body, he do nothing and walked away.

After a while, a second man appeared and he saw the dead body and this man took off his clothes to cover the girl's body then he walked off.

Then a third man appeared and he saw the dead body and this man dug a hole and buried the girl.

The scholar doesn't understand what the whole thing was all about, so the monk told him that actually the dead girl was actually his girlfriend in her previous life, he was the second man who covered her up and now she was back to return him a gratitude she had for him, but the one she would married to, was actually the one who bury her.

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Any one of you understand the story?
In our life, we always thought we are the third person but maybe we are only the second one after all.
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Sometime in a relationship, maybe our love are not strong enough to hold us forever.