Re: cepheus/alastair.
He did not argue though when you told him such a thing? Try to convince you of the merits of remaining hidden or try to talk up remaining hidden or going back into hiding so to speak? To play devil's advocate for a moment, is he perhaps trying to push you away to see if he can do such a thing instead of dealing with his own fear which seems prominent within his actions.
If it has only been a week, perhaps you should give it a bit longer to prove to him that being out is worth it? Did you enjoy going out with him? Is it something you wish to do again?