Housemate who rents my spare room is late twenties and most Saturdays will spend the night away and not here, says he is staying with a friend. However every time he does this he deletes his Facebook account. I can usually see him on 'Nearby Friends' but not when his account is deleted; he will then reactivate around the time he arrives home on Sunday.
Background: he has good job, social life etc and otherwise all seems very normal.
Would it be ok to question him on this behaviour as I just think the deleting of an account specifically for this time period is strange and suggests dodgy behaviour?