Everyone gets hurt!
Life is not fair!
Sentimental people usually have a thin skin and oftentimes have unrealistic expectations. They're more likely to internalize pain and take things personal as oppose to viewing it as an unpleasant event.
No one lives a life that's only filled with sunshine and rainbows.
In fact if there were no storms there would be no rainbows.
"Sometimes you win. Sometimes you learn." (You move on)
Life is not about what happens to you.
It's what you do with it that matters most.