I do hope you contact your parents now nic, you really need that support that you will get from them.
Like others, I think the phone call was very telling, he is trying to blame you for everything, and it is probably a smoke screen for his real actions. Be prepared for more to be revealed soon.
He can't simply decide to put the house on the market, it is your family home, and an asset of the marriage.
You need to start taking practical steps to find out what you are entitled to, what he will need to pay the children. Start gathering paperwork today, his NI number, wage slips, pension information, savings, he left the house suddenly so it should all be there ready to collect. Start a dossier, at this time more than any other, knowledge is power.
Also start a detailed journal, his story will change so that he presents himself in a good light to everyone, your record will prove what a slimeball he is.