My best friend trying to set me up.

My best friend has liked this guy for 3 years, but he doesn’t like her back. Yet she texts him everyday and is constantly talking about him. She sees him every week cause they work together. The weird thing is, she is trying to set me up with him but I know she really likes him. She tells me she really likes him. I don’t know what to think. It really bothers me, because it makes me feel like she is not being a true friend. What do you think? Any advice?