Talking to my daughter about ex's new girlfriend

[beingbrave2008]

Wise ladies I need some help.
I am in the process of getting divorced which has been on going for 2 years now. I am still living in the same house as my ex and our daughter.
I have been convinced that my partner has been seeing someone new for a long time. She is someone who he has been 'friends' with for about 3 years and they have all spent a lot of time together (my ex, my daughter, her and her kids) although always lied to me about the time they spend together.
Yesterday he told me that he has spoken to our daughter and told her that he is now dating this woman. He has asked my permission for them all to go on holiday together.
My issue I guess is that for the last 2 years I have asked them to be honest with me about their relationship and they havent and now on one day they have finally admitted to me that they are a couple and asked my permission to go away on holiday.
This is so much for me to take in and I honestly dont feel its appropriate for them to all go away together while we are still married and living under the same roof (she is also still married and still living with her ex).
I feel like I want to speak to my daughter about everything as I know that he has, but I am really struggling with what to say to her as this is all so new to me and I am still really angry about it all.
Help what would you say to my daughter and how would you respond about the holiday!??

I understand that he’s broke your trust and lied- probably to make it easier still being in the same house after 2 years, but your reason to say no is selfish. Your daughter has met and knows this woman, even if it’s been done underhanded. Unless there is a safe guarding issue, a safety concern, saying no is just because you’re pushed at him. He’s gone about it utterly wrong, he shouldn’t have told your daughter first, but other than he’s lied to you- do you have a justifiable basis to say no?

If it was me I’d be using this situation to get the living situation sorted. Respond by saying “you told me you weren’t seeing her so you’ve been lying. You also told our daughter before asking me. Not acceptable. It’s also not acceptable to be taking her on holiday with another woman while we live together. So it is a conditional yes because of your behaviour. If you move out within the next 2 weeks then I will give my permission for the holiday. If you can’t afford to move out then you shouldn’t be paying for holidays. Sorting out our horrific situation comes before jollying away with a mistress” time to be firm and get rid of him OP. For your sakes and your daughters. She’s going to be very confused surely!?! So you tell him that then based on his answer you then tell your daughter that she can go on holiday as long as daddy has moved out to his new house. It then puts the ball back in his court