my girl wanted to be friends on facebook why ignore me?

[Ben]

She was my ex, she wanted to work things out she hasn't talk to me, I ask her whats the problem, 7 days ignoring me , 2 weeks ignoring me on facebook, did I cross the line calling her a bitch
We were broken up for 7 months, she put photos of her self up for me, but has answered my questions, I know shes not dating she wants to met me, why do woman act this way , cold and hot
We broke up because I betrayed the first time in my life, we haven't seem eachother in 9 months