I thought this girl was really interested in me, she comes up and hugs me all the time, always emails me and tell me to call her, and so usually i talk to her about once or twice a day for 10 minutes or so. On messanger she is always like Hi babe, what do you think about going out to lunch, darling? I can't even tell where she is coming from, she seems serious. She emailed me asking if i wanted to go out to lunch today with her. I said sure and that i would give her a call in the morning, but i ended up talking to her that night and we decided that we would go to some cafe downtown in the afternoon. Well she emailed me in the morning before i called her, saying that she wanted to maybe go shopping in the valley too. So replyed that, that sounded cool. I gave her a call and she was taking a shower, so i left a message with her brother. I called back later and she had left. No big deal, he prob. didn't tell her.But it made me question some things. Should i pursue something with this girl? I am recieving mixed messeges. Oh, and one other slightly important detail

she has a boyfriend, but i think the relationship is gone on a little too long, and she wants out. She has been hinting at it for a while, but still it makes me kind of uncomfortable. So what should i do? Sit on the sidelines let her give me instructions and see things pan out, or should i continue to go out with this girl and flirt. By going out, i mean she has asked me to go work out with her, we have gone out to lunch , and now she wants to go out to lunch again, all this with in this last week. Just confused, can anyone shed any light on what i should do next? Thanks for reading, i know that i kind of rambled on, but i am confused and i really don't know what to do next.
Thanks,