Is it weird to have a blog your SO doesnt know about?

Amthyst

I've had this blog since I was super young. I went through a lot in my life and it just kind of became a place I let out my feelings bc it was where I felt comfortable. Its always been a secret. Not even my best friend knows about it. My SO snooped on my phone a found it about a year ago and just recently told me. I dont ever really say anything wrong but I do vent about our relationship and thats why she hates it. She yells at me now when she sees it. Am I wrong for being upset that she found it and didnt tell me for so long? I'm a very closed off person and I need my space, I need something that's just mine and it hurts that she took that from me.