Should I stop being friend’s?

We started going to the gym about a year ago and everything was going great. She would tell me about all of her gym crushes and stuff and we would have conversations about them, whether they been on dates or not or if she was to shy to say hi (pretty much banter). I’ve never actually told her if I had any gym crushes or if I thought one of them was cute. Until recently someone actually caught my attention and I made a comment to her. Since then she would joke around that my gym crush was there and stuff. She also use to say that she was glad we had different type of guys we liked. Then out of nowhere she tells me she going on a date with him. That really got me upset and I just acted that was happy for her. I really don’t know if I’m overreacting or not.