harbors
Hello,

Can anybody help with the expression below? Thank you!

"Have you ever harbored a secret? It's crippling"

harbored = to keep it secret for a long time never to reveal to anyone. 
crippling = it is causing you problems emotionally by harboring it inside yourself. 

a harbour = a safe place at sea to anchor a ship in a sheltered bay or inlet.

Hi, "harbored" in phrase it means "keep a secret" 
keep (a thought or feeling, typically a negative one) in one's mind, especially secretly.

It kinda means “hiding” “keeping”. “Have you ever kept a secret?”