Originally Posted by FairyCrystal

Revenge? Incredibly immature... Normal, healthy adult people learn to deal with pain and sorrow in life. It's part of living. When you know you cannot handle a breakup, you may be better of staying single. Learn to deal with loss and pain, grow as an individual so you can stand on your own two feet, even when life gets hard for a bit.
Holding someone else responsible for your happiness is not right, nor healthy, for neither party.

If you think it's right, spiritual even, think about someone doing this to you when you have done nothing wrong other than not loving that person as a partner anymore. How right is it to be treated that way?
It's acting out from a hurt ego, not from the heart. That's not spiritual, that's nasty, and immature. An indication of someone who cannot handle life.
The only thing spiritual about it is that it may be part of their path to learn to grow up.