Boyfriend lied about going to bed..

Yes he lied about going to bed. My sister got me out of bed to sign into his account,she got disconnected and I thought that was weird because me and my boyfriend only know the password. (We use his Xbox account so we can get into Netflix) then when she tried to log into the account again the password was changed like what the hell? Why do you lie about going to bed? I texted him and what do you know he's up and said he is in bed.. I don't need bullshit lies