How to get my name off mortgage with ex partner?

So 7 years ago i bought a house with my ex partner. We split up and since then he has lived there alone and paid the mortgage. We are still mates and get on well. I am now married to someone else with a baby on the way and we have come into some money to put a deposit down on a new house for us to live in. Our new family home! BUT my name is still on my old mortgage and the lender wont let my ex take it on by himself, even though he has been paying it for the past 5 years! My husband cannot get a mortgage in his name due to his old business going bust and he has bad credit. So the new mortgage would have to go in my name but i with my name already being tied to a mortgage im sure i wont be able to get another will i? Can anyone help or advise the best thing to do?

Thanks.

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