Boyfriend won't give me his Facebook password

Anonymous
Firstly, my boyfriend and I have been dating for 3 years now.we have been talking about marriage already. I use to have his password to his Facebook before and use to confront him when I felt uncomfortable when girls were flirting with him. This bothered him, as he said he knew what he was doing and would handle things on his own. Recently he changed his password because he thought I didn't trust him and that what happened on faceboook was his privacy. But I found out as soon as he changed his password,(as I was able to get into his hotmail account) he started adding a lot of people including this girl I made him delete because she kept flirting with him. What does this mean?
Boyfriend won't give me his Facebook password
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