My gf is confusing

I don't know what to do. I got married on April 29th 2013 and divorced in June because she cheated. A week later I met an amazing woman and fell hard and fast (there was nothing I could do to stop it) We moved in together. she has a 2yr old daughter whom I love dearly. Our problems started when I noticed she flirts all the time. She says she's only had sex 6 times before me but I don't believe that. She tells me all these stories about her and her exs and I don't know why she thinks I wanna hear about her and other men but she constantly does it. Also recently I decided to go to school for theatre and started writing a book, she seemed supportive, but when we got to her moms house the day after she told her mom my decision to take on theatre and about my book, when she told her mom my gf laughed about it and has made little jokes about it...it really bothered me but idk what to do...I would love some advice about her talking about exs and laughing at my dreams..please help..don't be rude about it please

if it bothers you tell her so,discuss other things change the topic