Actually that's exactly the advice our MC gave me yesterday....and it's pretty much what I'd already decided to do. If "I" feel like responding to him I will, if I don't...I'm not going to, I'm not going to be false about it...and I'm not going to perpetuate his false sense of security by doing so.
If I respond in kind to him...it's needs to be done in a genuine manner by me because I feel like I want to, otherwise I'm not being true to myself.