Love Advice

Hey
Hopefully someone can help me out. Thanks.
So i work for fast food location in Canada, and there is an girl, when we first started working together, i thought she was a total bitch then when we started to work together more, she would accidently grab my ass and i would brush up against her, then she would put her arms around me and give me hugs finds any excuses to touch me. The other day we were standing pretty close, close enough to kiss, but we didn't, this has happened a bunch of times now. She flirts with me and i flirt back. She pokes me, i poke her back. accidently touches my ass, i accidently touch hers, she hugs me, i hug her. she misses me, i miss her, she doesn't talk smack about me behind my back, i make her smile and she makes me smile, she stand right behind me and grabs me and i do the same. We use to txt each and talk for hours until her phone broke. Whenever we work other staff and maybe the customers can feel the sexual tension.
She has a boyfriend.
I don't know what to do. I have strong feelings for her, and i have had few staff members come up to me and say something and then either me or her brush it off. I have Asked her out to a movie once then she said no, then a few weeks later i asked her out again and she said no then this past week i asked her out again and she said, maybe.
She said, yesterday, while at work they she should not go out drink with me or another male staff member, because she doesn't trust her self. What does that mean, (i know, but in that way)?
Then she said later she would go out drinking with that same male staff member but not me. What does that mean?
When i don't talk or Flirt with her, she comes and asks me why. She always starts it, usually.
Its like she does have feelings for me but its like she doesn't want to omit them or either rush in or hurt our later relationship or our friendship.
I don't know. What do you think? And she has a boyfriend and what does that say about that relationship.
Thanks for all the help.