Newly separated -joint mortgage - in need of advic

Hi, this is my first post.

I have made the decision to separate from my partner of 9 years. He cheated on me 2 years ago, least year we sought counselling which was good and we enjoyed a fairly good year together. This year talk moved to weddings and babies ( I have an 11 year old who lives with us), and I have decided that whilst I want those things I don''t want to do them with him anymore.

He has not taken the news well, I have been called all the names under he sun, had possessions thrown out the door and at one point, after he had been drinking, told me I wasn''t leaving and that he would kill me first. He says he doesn''t remember this and I should forget this comment but I cant.

We have just (nov last year) remortgaged on a 5 yr fixed deal and taken out a fixed deal for an extra advance. These are joint mortgages in both our names. He is threatening to stop paying the mortgage and telling me that financially we are screwed and I won''t get a penny. My understanding is that the house needs to be valued- expected at £80-£100k more than mortgages totals and that once early repayment charges and estate agent fees are deducted any remaining equity will be split 50/50. Out of my equity he wants me to pay him £15k that he put in as a deposit.

In addition he bought me a car as a gift last year, he put the deposit in his card which I paid off with the money from selling my old car, the car is in his name and he pays the finance monthly. He wants me to pay any negative equity on it when he hands it back.

Does anyone have any experience or advice they can offer. I am feeling bullied and like I am being pressurised by him all the time as we are living in the same house but separate rooms. He keeps threatening to take the car away leaving me unable to get my son to school and me to work and threatening to pay nothing toward the mortgage as he knows I can pay it on my own.