Rejected by girl, because she has boyfriend but situation is weird...

So I asked this girl out the other day for dinner and she said she couldn't because she had a bf...i was like whatever but she said "but I can introduce you to my friends...maybe you'll get invited out to a dinner or something". I said "alright what's your number?" and I got it. I've been helping her out with some college work and before I asked her out I told her I could help her if she needed it. I'd rather just be friends and not go back on what I promised (but maybe she wants me to just leave her alone lol). The other day she friended me on facebook so I'm kinda confused if I should call her or not to tell her I can still help her with school if she needs it (as a friend)...or should I just not call her?

Thanks
Rejected by girl, because she has boyfriend but situation is weird...
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