The higher you hope, the harder you fall.

For myself, I absolutely abhor the feeling of disappointment. It's the feeling when you've tried so hard yet the outcome turned out wasn't as satisfactory as you had expected. It's exactly like you've been shortchanged because the amount of returns may not and will not be always equal to the amount of effort you put in. How will all your effort amount to the scores on your report card, the number of friends or feeling of love etc? 

It's often ambiguous so ultimately, it boils down to the question of expectations. It's true that you'll feel less disappointment if you're expecting nothing at all. However, we shouldn't stop expecting from anyone or yourself because that's where hope lies. We have to accept finite disappointment, but at the same time, we must never lose the infinite hope we can have. 

But I guess that's just part of life and everyone will have to go through and experience such dark period, be it in love, friendship, academics, career, marriage etc. In the end, it's just how you deal with it, how you work harder to overcome it, and eventually become a better and stronger person. And never forget, one's best success usually comes after their worst disappointment.

Lastly, the size of your success is measured by the strength of your desire; the size of your dream; and how you handle disappointment along the way.

P.s. Good luck to all those who are going through a rough patch in your life!