I agree with everything fourever posted.
Honey..he is eating cake. He comes around,visits his daughter in your home,then leaves. MOW may not live in your state..but plenty of other women do. My guess is he is screwing around with more than "just" the one OW you know of.
You need to put a stop to this shit now. He may not be respecting you..but you need to. Tell him he is not welcome there until he has decided what he is going to do. He can visit your DD away from the home.
Read the 180. Do it.
My heart hurts for you. Im so very sorry he is acting like this.
Please get tested for STD's. Take care of YOU.
And find your anger. It will help you.
M: June 2001
..that feeling you get in your stomach, when you heart's broken. It's like all the butterflies just died.