advice re matrimonial home

hi just joined this and hoping to get some good sound advice. I was married years ago and have two children who are now 16 and 14. I met a new partner in 2003 and we bought a new house together in late 2005 to accomodate my exs two children coming to stay. i had previously owned my home to which my ex had moved in not long after we met. anyhow he asked me to get married which we did in aug 2007 and in january 2008 i was left a note to say he had made a mistake. to cut a long story short he left us with nothing he took his wages from our joint account immediately and left me to pay everything on my own. i have tired for 15 months now to get the courts to make him pay half of the property expenses but he has managed to avoid it. he left as he was having an affair. he wanted the house up for sale immediately and i refused as it is my childrens home and we moved there to accomodate him and his two children. i had a mortgage of £38k when i met him, he has now left me to pay off a joint mortgage of £92k. He has just issued a civil equity bill to force the sale of the house. Does anyone know what my rites are as the children are not his own.
Thanks xo