Fake friendship all along?

I have a feeling someone I considered a good friend just faked the whole friendship and was just interested in being friends with me because I know this famous guy who knows this other famous guy she is obsessed with.

So, this guy I know - I was friends with him for +10 years, and things basically went down the drain after he got a new girlfriend. Long story short, he started behaving like an idiot and tossed me aside.

My friend (who I met after I met the guy) of course knew about the whole situation, and things suddenly changed in December when I told her about the last straw with guy. She basically disappeared after that. I checked in with her and she said she was having some issues with her meds. It made sense and I kept checking in from time to time. Then one day I asked if she was going to an event she had told me about, and she said she had already made plans with someone when he told me about it. This hurt because I felt set aside once again, and she got mad because I should've asked about the event earlier and not expect her to chase me about it (?). She sent me a scolding audio note I couldn't even finish because it triggered me. I told her I wasn't doing good because of what happened with the guy. She hated that. Next day we cleared things up on the phone, but there were things she said I didn't like. She spoke about the guy with a lot of hatred, told me I shouldn't be so affected about the situation with him, and said "this person isn't real".

I met her once after our argument and things seemed normal. But they aren't. She doesn't text me anymore. I've texted her a couple of times, but she never texts first. So now I'm starting to think she only wanted to be friends because I know the guy, and now that she sees she has zero chances (not that she ever had them, c'mon) with this other guy, she doesn't care anymore. She hates the famous guy now, and when she said "this person isn't real", I wonder - is she the unreal one? What do you think? Thank you.

Updates
+1 y
The other famous guy is married with kids and is from another country. The guy I know worked with him years ago. They aren't friends. So when I say my friend never had a chance, it's because she really never had a chance.
Fake friendship all along?
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