Why didn't he change his Facebook passcode?

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My cheating ex disgusts me so much and I dumped him yesterday after logging into his account (he gave me the passcode) and seen that he was in a relationship with someone else. I also might be pregnant by him and I don't intend on getting an abortion because I don't believe in that nor do I have the courage to give my kid up for adoption. Anyway out of curiosity I logged into his account and he's already telling another girl he wants to be with her and do sexual things with her. I am crushed!! 2 days ago was the last time I seen him and we were intimate and he told me he loved me.


What I wanted to know is why didn't he change his passcode yet? I'm angry and hurt and can post things to his wall, post different pictures shouldn't he be concerned? Or maybe he didn't change it because he knows I'll check his page and wants to hurt me?
Yes he knows that I know his passcode because when he called me I told him about what I seen on his Facebook and he was trying to say it was someone from the past not to be worried. But from how she was talking I doubt they were broken up.