I need someone's advice.....
This has been an on and off relationship for a few years unfortunately 2 children are involved. The other night I was exhausted on the settee so I kept closing and opening my eyes I looked up and he was getting up and looked back and just went upstairs and to bed....I messaged him saying have you just gone upstairs without saying anything....his reply .... YES IM IN BED you were fucking sleeping just come to fucking bed....anyway I decided to ignore his polite offer and stayed downstairs until the younger one had woke for a bottle.
In the morning I just didn't want to speak to him he came in and said "you need to change your attitude because I'm going to leave" I was like my attitude? Sorry? Anyway he said I'm always miserable etc he went off to work then received texts saying he's not doing it any longer he wants to wipe the slate clean with someone else so he's not called abusive bully and no good. I said what because you are those things when we get in an argument....
Anyway I messaged him and said what's the point in talking if you have already made your decision....he was supposed to finish at 10 and I was outside having a cig (stress) and he could see my texts sneakily behind me (I didn't even know he had came in) he was like who are those laughs faces to are you taking the piss out of me (it was my brother and a totally irrelevant to him) I said none of your business he slammed my phone down and said tell me now, he said your sons feet are cold is that all you do sit outside on your phone and smoke and pushed my sons feet in my face. He then contunuined to ask me who I was messaging and prodded me hard in the side .... things escalated as I wasn't reacting the way he wanted being abusive etc I said I was going to phone his dad he snatched the phone out of my hand and I literally had to fight him to get it. Anyway he kept coming behind me saying I'm going to drag you out of this house I'm not living with you. (So basically throwing me and 2 children out of a 3 bed house so he can move a mate in....)
Anyway his dad eventually comes and my OH went don't pretend to shake and cry when my dad comes. I tell his dad he tries to make things calm tells him he needs to go back on his meds then suggests we go for a coffee to clear the air...I obviously don't but do it for his dad it doesn't help. Anyway I said I want to do this amicably for the kids (the split) my OH storms out and comes back an hour later with a take out coffee and I say to him listen I just want to be friends and sort this out.
Today he comes in from his break pulls his thing out on the sofa and I go and ignore him pick my son up from summer school come back and he suggests we go upstairs for sex??? Is he living on another planet. I need advice how do I get him out?? 
Also can I just confirm is he a narcissist or am I just being over sensitive?