Magda, so lovely to hear from you. I'm doing a stealth post whilst at work because I wanted to reply sooner rather than later.
Firstly, cry, get angry, get all of those negative emotions out. There will be a lot of them inside and as you move through this (based on my experience in the last 6 months), you may move through a cycle of grieving too. All of this needs to come out and if your DP hasn't been topping you up emotionally, then you will feel low. That's ok, I promise you, you WILL bounce back.
Secondly, well done you for doing all the hard work with your DC. All I will say is this, your children aren't blind. They may not say anything, but they see all. You're an amazing parent and you will always have that in your corner. Plus you are showing all of these children that working (outside of the home) and parenting is the normal. They see a strong woman, thats a great role model!
Thirdly. I'm glad you've been that honest with your therapist. You sound as though you are surrounded by people who are 'takers' and who have gotten used to the dynamic of you being the 'strong one'. So they take, as that is the modus operandi. It's not great of them, but you also need to take some responsibility as how often do you sit back and let others be the strong one? One to think about.
The trick now is to surround yourself with people who do do things for you. Who make you laugh, make you dinner/a cup of tea, who get tickets to an event that they know you will love. People who are able to be strong for you. We have those people around us, lean on them, tell them you're low and you need their support. I did and I was amazed at how much my small inner circle stepped up and it was the smallest of things that made the difference. This also includes your children. It does your children no favours to see you always as the strong capable one. For them to flex their empathy / compassion muscles, they have to think 'what does mum need'.
I promise you, the old magda is in there and she will come back. I am a completely different person to the one 4-5 months ago. It's not been easy, but it's been very worthwhile.
Finally - your DP and his DC? Switch off - I laughed when I read about that list. What a bunch of entitled, spoilt, rude children. Be grateful they are not your children and leave him, his EW and his DC to implode/ figure it out/ or not. They are no longer your concern.
Re the convo with your DP, honestly, I wouldn't go that far re the house. You know why? It's heightened emotional engagement and it won't be a conversation that would go well. He is going to respond one of two ways to a conversation like that.
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He is going to tell you that you are the problem, why are you being a drama queen, how could you do this to him right now....blah..blah...blah (so the basic defensive deflection to try and guilt you)
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He is going to beg and plead with you to give him a chance, grovel and promise to change. The reality is he won't as he is too consumed with what he has on his plate.
It will become emotionally charged and I don't think that will help you based on where you are right now.
I would personally calmly tell him that you appreciate that he has a lot on his plate, that his focus needs to be on his situation and you're understanding of that. But in the meantime, you're going to start seeing your friends a little more and book some trips in and just focus on yourself for a while. That's all you give him, remain happy and calm.
The one thing I would say about these men is that they are in high conflict situations with their ex and it very quickly can become their natural dynamic that can bleed into your relationship. My DP and I did this. So what should be a calm, open, loving conversation very quickly can descend into attack, defend and repeat. Because they view it as another attack. It gets you nowhere as you just leave even further emotionally depleted. (apologies if I'm projecting my experience, but i'm sharing on the off chance that it's happening with you too and you perhaps can't see it yet).
Then step back, start taking some you time and see what begins to unfold. In a month to 6 weeks, if you still feel the same way about the house situation, tell him then. You've compromised this long, another 4 to 6 weeks makes no difference does it? Start house hunting by all means....but give yourself (and your DP) some space before making such big life changing decisions.
Don't throw the baby out with the bath water just yet. You need fresh bathwater, it needs refilling / topping up, but the baby may well be ok. You/ your DP may make it through this, you may not. Just for now, step back and breath.
You're never alone, we're always here x