I don't want to put my fiance's name on a house bought with my father's life insurance money
Does your fiance want their name on the house?
He it's the only way to keep our relationship together.
Your fiance shouldn't have any claim to this house. As your partner, he should respect the fact that the house was bought from funds brought about by the death of your family member.
He is a leech who is trying to ruin my life. I want to leave him so that I can buy myself a car and pay my own bills.
You don't have to put up with poor treatment by your bf. It sounds like you know the right thing to do here is to leave this relationship and to not put him on the deed to the house. I wish you luck in your new life.