Getting your hopes up
The only thing worse than getting your hopes up for no reason is not getting your hopes up at all.
Life comes with disappointments, missed expectations, and many unseen, unfair events. But don't let that take the hope out of life. Some things do pan out. Some dreams do come true. Some people are really worth loving.
After a disappointment or heartbreak, rest. Heal. Take time for yourself. Search your memories for lessons to be learned, then let go of that pain and move forward.
You've got this life, from now on. It won't be all sunshine from here on out but you've got to look forward to and enjoy those sunny days when they come your way.
That's a big part of what life's all about.