I think if you break your 12 month lease before 6 months of residing in the property, that thousand yo-yo's is his. However, if you can hold out another 3 months, give him notice now, he has 3 months to get new tenants in and there's no reason why you shouldn't be given your deposit back. If you can't hold out your only option really is to try renegotiate the amount of rent you pay to something you can afford or since you're there 3 months he can give you back a quarter of the deposit.