Caught my gf snooping through my journal tonight

Long story short: I hop in the shower, do my thing, hop out and put on my night robe. Walk into the living room ready for a Netflix movie and she is standing there all confrontational looking and says "Question." I say "yea?" She says "So when were you planning on telling me that you weren't happy?" I look over on the living room table and there's my journal wide open. I kind of snap and say "WTF do you think you're doing reading my journal??!!" She said that we are lovers and shouldn't keep secrets and is glad she read it. I told her she was crazy and doesn't respect my boundaries and stormed out. Perhaps she knows now why I'm so unhappy and have to journal ab it.