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Like the other commentors and Cary, I think this situation isn't what's best for you. You should get a place of your own and if you want to continue a relationship with the guy there's no problem with that. It seems like living with this girl is what's bothering you and that's perfectly fair. Living with people isn't easy in the best of circumstances. Dad doesn't seem to be able to make decisions or handle things. Do what's right for you and it'll no doubt be best for everyone. This arrangement you have sounds terrible.