<human>: Can you provide a brief overview of the text?

I have never felt so violated. He has been my best friend and the person i confide the most to for the last 5 years, and today I found out that he has been logging into my facebook. He was at my house today, he lives in a town about an hour away so we don't hang out too often. This morning I noticed a lot of my messaged said seen on them, but I never read them. I thought it was just my phone acting weird, because I don't have the best phone in the world. I got suspicious thought because It kept happening, so I checked my active sessions. 40 from his homwtown from this last month, and I have not been there. There were also 3 session active at the moment from my house, my laptop, my phone, and his phone. I freaked out and immediately logged out of the sessions and set up notifications so i know when someone tries to log in and from where. 

Before i even had time to reset my password, he logged in again. I went downstairs and acted casual and said I had to leave. I went in my car and drove away and had a panic attack. He left at the same time as me, but i don't know how to address this. This is something I feel only a fucking isnane person would do. 

Every conversation i've had as not been private. Someone that I trusted has been sitting there reading EVERYTHING. he has seen all the risque things  I have sent. He has read every intimate detail about my fucking life. I am so revolted. I have no idea how to go about this.  

I have secured my facebook, it now needs a code that can only be texted to my phone to be able to log in on any device that has not been authenticated yet. I als odont know how he got my password in the first place. 

What do I do.
<bot>: Friend has been reading all my facebook messages for the last month at least.  I never gave him my password. I secured my accont but idk where to go from here. I am freaking out.