Is my best friend jealous?

We both vape and she told me that the vape shop that she goes to has a really hot owner. So I went with her to see for myself and he was gorgeous! I spent a couple hours there with her and was kind of flirting with the owner. After we left I told her that I wanted him and she said "GET IT GIRL" and then on Friday I went to the vape shop by myself. I ended up spending most of the day there and the owner asked me out on a date. I'm 20 and the owner is 29. I called my best friend after to tell her everything and she had this rude attitude saying that he was too old for me and stuff but she wasn't saying that a couple weeks before. I think she might be jealous? But I'm not sure. She isn't really talking to me much anymore and I have no clue what to say to her or what to do. I don't want to lose my best friend.