Is my Girlfriend a ?

Not too long ago I found a DVD o in one of her drawers and it was one of just women doing each other judging by the cover. And today I found on her computer's history that she was browsing through casual encounters for W4W and in Personals for Women Seeking Women? I confronted her about this and she told me when she was young one of her cousins was looking molested her and would touch her. And that now she is just curious about women but admits and claims that she is not gay but is JUST curious about other women at times. I have been with her for a little over 2 years now. And she has even lately been pushing the issue of wanting to get married already. What is your advise?