I think it is very wise to be cautious about such a big step and considering your position if it doesn't work out. (Men can be great boyfriends but bloody awful housemates!) Either come clean to all or keep it all under wraps. But be careful, they can track you down if you apply for credit together, for say, a washing machine, you receive post, joint bank accounts, etc., etc. As I understand, if you live together and you can prove that you made a contribution to the house, (split the bills, paid for shopping, etc) you have a right to some of the assets if you spilt up. 'Stay' with him for a while, occasionally returning home, give it a couple of months and then go for it and inform the powers that be. It's not worth the deception and paranoia in the long run!