Lets hope your boyfriend is as clueless! I think you should forget about this idea of moving out and forgetting all about it. Your house is worth less than when you bought it.quote]
Don't think we can say this without being provided with specifics.
To the OP you need to get a valuation done on your property and find out the balance on the mortgage you will also need to calculate how much each of you put into the house initially (Deposit,furnishings etc). It could be that you will be able to get some money back and then again it may cost you money depending on how much the house is worth versus how much to redeem the motgage.