Ah, well it's been said here, already. Blood is thicker than water. Whatever happened that's caused anxiety for him is likely the reason why he's taking space away from you. This isn't between you and him. It involves his family member and if he's living there, it's a tough situation to be in. I would not go over. Respect his decision for now and accept things for what they are until he's able to talk with you about it.