I am so sorry that you are having such a rough week. I can feel your hurt and frustration. I wish I knew what to say to take it away, but I know from experience that you just have to work through it. You will come out better and stronger, of this I have faith.
I think that boundaries are important and will save your sanity. Remember, the OM is not about you. I agree with ILF, I would let W know that you heard the convo. Everytime I let H know that I know he is lying, the guilt closes is and he learns that he can't get away with this without consequences.
You need to do things for you and detach from W. Protect D from this behavior, play with her, bond with her, and take care of yourself.
I have faith that we will all come out of this stronger and ultimately happier. God Bless!
K
p.s. I am no longer posting on this thread, so please come see me on my link in Newcomers. I very much appreciate your support and advise.