First things first, do you have a solicitor or you trying to reach agreement yourselves first?
Do you want to stay in the house? Have you had the house valued?
If you decide that you want to stay in the house, you would need to get it valued, apply for a mortgage & you might also need to give your husband his half of the profits.
E.g. if the house is valued at 280k, you would need to re-mortgage for the 175k mortgage you currently have plus the money your husband would want - so imagine this is 225k. Would you qualify for a mortgage that size on your own? Can you afford it?
There's a lot to think about - you could also sell the house, pay off the mortgage, split the profit & go your separate ways? It really depends on your circumstances, whether you want to stay in the house.