Why do females lie about the littlest things and keep the dumbest secrets?

I was in a two year relationship that ended like three days ago. I found out my ex was keeping a lot of shit from me and making it seem like we were actually going to make it work this time. I don't understand what I did wrong, if I did anything wrong, and I don't understand why it was so hard to talk to me.
Why do females lie about the littlest things and keep the dumbest secrets?
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