Maybe not come out as such but not hide anything either. Coming out makes it a big thing which communicates to them that you are still unsure about it. Being nonchalent and confident without stating anything explicit unless they ask you directly communicates to them that it's not a big deal. Of course they will try to make it a big deal but you don't have to let them.
Move in with your boyfriend and when they press their concerns, the onus is on them to justify why they think it's an issue. If you come out to them then the onus is on you to justify your non-belief.
Move in with your boyfriend and when they press their concerns, the onus is on them to justify why they think it's an issue. If you come out to them then the onus is on you to justify your non-belief.