Separate bedrooms

Da
So today I finlly found out the truth , with was that my boyfriend old flat mate was his ex girlfriend who he keeped on living with here in the same flat for six months after they broke up(he hid it from me always claiming that his flat mate is not nice and that is why he is not bringing me there) I kinda guessed on my own much earlier , but he did move in another flat about a month and a half after we meet, the thing that was most odd that he told me was that they always had seperate bedrooms even when they were together , I found that so odd why live together and not stay in the same room. What is your take? I don't think I would even move in with my partner if that was the living plan