Disappointment...

Can't help feeling so disappointed with my current boss and supervisor...
I was given a good grade for my appraisal this year. However. they have recently heard from a colleague which I confided in about my plans to leave the company and asked me about it during appraisal. I felt a tinge of betrayal. Why that of all times? I do not intend to keep it from them since I had already decided. So, I went ahead and told them the truth. To my disappointment, they actually wanted to change my appraisal grade in view that I may not be able to benefit from it if I intend to leave soon. At the moment I really feel like crying. This is so so unfair... If they think I deserve a good grade, they shouldn't do that to me. It's not the monentary value that counts. It's the satisfaction that you get from knowing that you have done your job well. Therefore, getting a good appraisal grade is like a form of encouragement for me. Although they didn't make any changes in the end (but who knows whether they will change their mind later...), it was already a wound etched deep in my heart with recognition of what kind of people they really are.
It's really hard to have employers who do not understand or appreciates you well enough. If they still decide to change my appraisal grade because of such a stupid reason, so be it... Maybe I had made a right decision to leave after all...