Girls, My boyfriend changed his facebook password after I went on it, why?

haileybabyxo
We've been in a tough spot recently. He actually moved out of my place because he needs to get his life on track which is great. However recently, on facebook, he added this girl from highschool. I asked about her because i was curious and he said she works with his mom, and its nothing to worry about at all. I asked if he was talking to her at that second and he LIED to me. He said no but i legit had proof that they were talking. I was on His fb and saw it. He didn't believe i had proof and i had finally said "i have your facebook password". He got instantly mad and said he can't trust me and all that. Now they were talking casually, nothing bad. But he did lie to me then ended up changing his facebook password. Is that shady or not? Being a girlfriend of a year, i feel, if its causing suspicion, id like to look for myself to feel okay. What ever happened to the "go through my fb & phone. I have nothing to hide" this seems, so shady to me that he HAD to change his password and, if he really has nothing to hide who cares that i was on his FB.
Girls, My boyfriend changed his facebook password after I went on it, why?
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