Locked away heart

Have you ever felt a terrible ache in your heart while having a good time?
This ache snaps you out of your state of euphoria. Your heart sinks.
What if this is the happiest you'll ever be? Or, what if you'll experience something that makes you happier? Despite the tremendous joy you are feeling in the moment, this ache is present, It's taunting you, reminding you, that at the end of the day, the memories that you're making will soon be just another painful memory.
Perhaps you can only get out of this cycle if you find true love.
But what if you can't find it?
After years of searching you might as well give up.