What is bothering me is why she is continuing these flirtations, hiding them, lieing to me, but doesnt want to lose me at all.
Most of the things you're questioning, you've answered yourself. What you wrote above is a good example.Only one point though, she is dependent on me emotionally and financially. I treat her like a princes. I supported her in her career and everything and anything.
She's abusing you, emotionally, financially, psychologically. It's hard for you to see because you don't think the way she does, and you actually care for her.
But if YOU did the things to her as she is doing to you, would you say she would be right to divorce you? Of course you would.
Reverse the scenario and tell yourself what advice you would give. I think you're seeing things through a loving, naive filter, but you know the truth; she's an abuser. It just hurts a lot to consider it.