I live with my son who is 7, I have separated from my ex over 4 years ago.

I am in love with a man and he 'stays' with me (his words) most nights.. however he still continues to spend time at the ex's house (which is still in his name and he still pays half the mortgage) even though she and their 2 kids (and her mother) live there...

He won't sell the house, he also has a business with the ex (even though she does no work for the business).