you'll regret it
Try it, you won't regret it.
Te arrepentirás de lo que has hecho.
You will regret what you have done.
Leave, or you'll regret it.
Si lo dejas, te arrepentirás toda la vida.
If you let it go, you'll regret it for the rest of your life.
— Adiós, muchachos (1987)
No pierdes nada y te arrepentirás si no lo haces.
You have nothing to lose and you'll regret it if you don't.
— Realmente amor (2003)
You’ll regret it.
You’ll regret it terribly.