Is it possible that you had a fantasy of what she should be like? Then when she was just herself you felt rejected, disappointed, hurt, deceived? That is what happened with my ex. I had a dream of what she should be like. When she behaved like herself I felt like she had lied to me. Made promises she couldn't keep. Sure, we had many good times; but the bad times started to outweigh the good. My advice is try to remember the good about her and let the rest fade into the past. Time really does make the pain hurt less.
"Beloved let us tolerate one another. For tolerance is of God and everyone that tolerates is born of God and knows God. He that tolerates not, knows not God for God is tolerance." 1 John 4:7,8