My ex is acting crazy and I have no clue what her behavior means, can anyone help me?

Long story short: I met a girl at the gym and dated for a while. It ended two years ago, but we had ups & downs over the next few years as I was rising in the film and TV industry.

A year ago, we stopped talking & I became a celebrity, gaining recognition. My ex moved on and dated someone for 3 months, it didn’t work out. Seeing my name everywhere started to affect her.

In April, my best friend told me she tried to talk to him about life, but suspected she was fishing for any info about me. In May, I saw her at the gym for the first time. She was wearing sunglasses, and I waved at her casually while on the phone, she gave a quick, dismissive wave and left the gym 3 minutes later.

In June, her friend began watching my Instagram stories again, and shortly after, my ex blocked me on Facebook (even though we were never friends). She deactivated her Instagram after everything ended, but she didn’t reactivate it until August where she blocked me there as well. I didn’t react.

In September, I saw her at the gym again. I smiled and waved to her, trying to keep it casual. She didn’t respond, just raised her hand slowly. Meanwhile, my next film was being promoted everywhere, and she saw it through the gym.

3 weeks ago, I found a water bottle at the gym and returned it to the receptionist, only to find out it was hers. When she picked it up, she got flustered when she learned I returned it. She told them we hadn’t spoken in months and blocked me so it’s odd that I’d return it. I sent her a casual text about the situation and mentioned a movie idea in relation to her canister we had once discussed that took off but didn’t need her to respond.

A week later she saw me at the gym again but I was with the owner and didn’t notice her. Later, she came in the cardio room, saw me up close and then left the gym.

Then 2 days after that she vented to her girlfriend and then two weeks later she told the gym owner where he talked to me privately. What is going on here?
My ex is acting crazy and I have no clue what her behavior means, can anyone help me?
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