<human>: Quick details about us: I'm 20 (f), and he's 26. We've been together for almost 7 months. Both of us have been cheated on before in past relationships, so we like to be very honest with each other. 

So my boyfriend has always wanted an open policy about cell phones, emails, facebook etc. It started during our second date (before we were even gf/bf) where he would read through my phone (without asking. I was actually quite surprised he did that, but I said okay anyways). I generally don't have anything to hide unless it's some girl-to-girl heart session where someone wants to talk whole heartedly to me about their issues. So I'm okay with that. When we got together, he started to expand from reading phones to emails, facebook, twitter, or any accounts I have. To be fair, I'm allowed to do the same, but I'm generally uninterested to peruse through his things so I don't. However, I've never really been okay with this "open" policy because I feel conversations with other people being read by unaffiliated parties is a rather rude gesture on my part. When I mention that I feel like it's an invasion of privacy, he asks me skeptically if I'm hiding something. 
Just recently he actually responded to a PM on facebook to a friend of mine saying it wasn't me, so I got annoyed and said if he's going to creep on my facebook not to read nor respond to my PMs.

Reddit, what's considered hiding and what's considered okay for privacy? I feel like I'm trying to be normal, but he perceives as a chance for me to be all secretive. I've let him, from the start of our relationship to even now, have the ability to check and read my personal things. Now that I'm asking for a little bit of privacy, he thinks I'm not trusting him enough.

Can you summarize the given text in a few sentences?
<bot>: Boyfriend reads everything private of mine (emails, fb, etc.), and I'd like to gain some privacy back.