Disappointment

Question

How would you say "I'm sorry I disappointed you"?
here's what I came up with
Lamento si he te dado decepción

but it sounds stilted. Better way?
thanks

Answer 1

Siento haber sido una decepción para tí.

Answer 2

Siento haberte decepcionado.

Answer 3

You could also say "Siento haberte desilusionado."