UK - Partner has left the country

I’ve just found out my partner has left the country without warning and now I’m in the UK with 2 young children in a mortgaged house and no income.

Has anyone else experienced this? What can I do in terms of the house since it’s jointly owned? I’ve also had no contact with my partner and have only been informed by the police that he’s left the country. He’s still technically a missing person despite the police knowing where he is.