Otherwise just STFU about loving his D. A Dad doesn't walk away.
That's what I'd say.
Coly--
Just to be clear, I'd say STFU to your WH, not to you.
I wasn't going to get into it in this forum, but my D13 is a step daughter. But I've been her Dad since age 3, and I never call her anything other than my daughter -- except if I'm filling out some legal paperwork.
So I have special sympathy for what's going on between your D15 and your WH.
All your difficulty letting go ... tells me that, like so many people here, you love deeply and you are a very loyal person.
Glad to hear you had a good day. One day at a time. I just try to survive one day at a time.
Me: 50, MLC/WW 45 Young kids Nov 2015: BD1 Apr 2016: BD2 Jan 2017: W filed Feb 2017: D final