OP, in one of your recent posts, you asked for "help ". If it helps, some things that may happen when you have the Conversation on Friday:
(this is only from my own experience-if you feel that you would in any way be in jeopardy on Friday, it might be a good idea to have someone else with you, just to be safe and to support you. Also, try to say what you need to say when your child is not around)
Things he might say:
The anger/defensiveness/denial:
I don't understand what you're talking about? What problems? What issues?
Where is this all coming from suddenly? (faux innocence, or maybe he just never thought about your point of view at all)
Why now? What's changed? (then you spend the next few hours discussing how things used to be and why this is your fault because you're not giving him a chance to change)
This isn't fair, you're ganging up on me (if you do have someone there to support you)
Don't you love me? I thought you loved me. (and it will be all about him)
Why are you doing this? (after you've just explained why you are doing this)
Why are you doing this to me? (nice tactic change)
What about my kids? Where are they supposed to go? I guess you never loved them. ( the guilt thing)
What about all the great times we've had together? (when you are trying to talk about the present, not the past)
The bargaining:
What have I done? Why can't you just explain it, then I can try to change? (this is so that you spend the rest of the day arguing about what he has or hasn't done, so by the end of the day you are exhausted, confused, and he gets to spend one more night in your house, and you have to start it all over again the next day)
I can't do everything, can I? Surely you understand that? (you are the unreasonable one)
Can't you give me some time to process this?
What is it you want me to change? (putting the burden on you to define EVERY SINGLE LITTLE THING THAT NEEDS TO CHANGE so that if he, in future, does something similar, he can say that you never mentioned THAT)
What are you going to tell the kids? (meaning, YOU will have to explain to MY kids why YOU are doing this to them)
Let's ask [your child] if he wants me to leave. He won't see his siblings again, is that what you want?
If you want me to just do more around the house, spend more time with you, why don't you just say so?
What about the five years we've been together, do those years mean nothing to you?
What if I asked you to marry me? (note: he did NOT just ask you)
The demands ( when he realizes that you are serious):
Tell me EXACTLY what you want me to do and I'll do it. (again, you'll have to think of EVERYTHING, because he'll get around it somehow if you don't. This also buys him time)
I need time to put things in place. You can't just tell me to go immediately.
Well, you'll have to explain to my kids why you're throwing them out on the street (the guilt thing, and, of course, they won't be out on the street)
You're being so unreasonable, not even discussing this.
If we're over, then it will be all your fault, because you won't even let me try to change.
If I go, that's it, I'm not coming back, even if you want me to. No, you said this isn't a discussion, so I'm not going to discuss it!
OP, your response to all of this is: you are not going to be living in my house anymore. I'm not discussing it, I am telling you.
As much as you can, stick to the outcome you need. Don't get into lengthy discussions about why, what, and wherefores. He will blame you for everything (it doesn't matter). He will tell everyone else that it's your fault (who cares? you will have what you need).
Once you have what you need right now, your own home back, you can have plenty of discussions later (if you want to, but my guess is that you would get tired of that pretty quickly).
I don't know if any of this will help, but remember, you are not asking him to leave, you are telling him! You don't have to entertain ANY of his questions. The answer to all of them is BECAUSE THIS IS MY HOUSE AND THIS IS WHAT I WANT AND WHAT I WILL HAVE.
PS Have you noticed that nearly all of "his" responses are simply answering a question with another question? Until the demands start. My ex partner did this all the time.
Again, this is very long, but if any of it helps, then it's worth remembering. I think you can tell by now what my relationship was like for more than 15 years! I still remember most of it, but at least I can now view it from the outside.