What are my right with regards to house?

[sceley]

Me and my partner have recently separated, we have two children, when we purchased the house my mum gave me £6500 for the deposit and he put £500 down, the mortgage initially came out of a joint account but then we got separate accounts, the mortgage was paid from his account, while I paid for all the food clothes, going out, holidays, car, petrol and other bills on the property, he now says he wants half of everything, I said we both take our deposits back and then split what equity there is left, what are my rights, help