I’m having a situation with a very close female friend and I’m not sure how to handle it?

So I met this friend of mine and we hit it off immediately and developed a great bond right off the bat. We met in the gym and had established that we were interested in spending time together outside the gym. That hasn’t happened to this point. Now I find out through a friend that she’s actively dating someone and is apparently trying to hide it from me. I can no longer see her stories on social media and that’s apparently where she’s posting about him. Why would you hide that from one of your best friends? I’m super confused and feel like that’s a massive red flag, but I really do like her. So I’m
not sure what to do from here.
I’m having a situation with a very close female friend and I’m not sure how to handle it?
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