Why was my old friend being BFF so distant and cold with me?

Yesterday my best friend (let’s call her Kristina) and I met up with with our old friend since middle school. Let’s call her (Sammie). We haven’t seen her since she moved away after sophomore year. So when we met up to have lunch and hang out, Sammie was telling us about how her life as been and working, but she was mostly looking at Kristina and not me. When I talk, she doesn’t even look at me but when Kristina spoke, she looked interested and listened to her. Wow that was rude. When Kristina went to the restroom, Sammie just started looking at her phone. I asked her a question but she just ignored me. I was like, “Hey I’m talking to you. Why have you been ignoring me.” Then when we left, Sammie hugged Kris and when I went to hug her, she pulled back and said, “Don’t hug me. I don’t wanna associate with you. She looked down and looked like she’s telling me to go. I was hurt but left. I told Kris about it and she noticed that too and told me we’ll have to talk to her about that.
Sammie used to love talking to me and hang but now, she’s salty and bitter towards me. What the hell?

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I asked Sammie if I did any anything but she ignored my question.
Why was my old friend being BFF so distant and cold with me?
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