Well your impulse feeling is just that, and you stepped back from it and stopped yourself from acting on it. I'd say that you took a big positive step there.

You knew that by putting your friend down you would only harm your friendship.

I wonder if this feeling you have may be a positive cue to change things in your own life? So you can feel happier.

Btw I do not think it is healthy to rely on one relationship (like your friend is) to experience happiness - it is too fragile.