I tried to make this girl who rejected me jealous. Now she’s blocked me and might be dating my friend/colleague. What should I do?

I wanted a side relationship with this girl, who seemed like me (being that I’m already in a long-term relationship), but she said that we were just friends. To get back at her for friendzoning me, I’ve been trying to make her jealous. Now she’s blocked my number and on IG and it seems like her and my friend/colleague might have something going on. My friend claims that nothing is going on, but I don’t believe him.

I thought that her blocking me was immature and petty (although I didn’t expect any better from a 26 year old), but her going after my friend is spiteful. It’s like they’re dating just to get under my skin.

What should I do?
I tried to make this girl who rejected me jealous. Now she’s blocked me and might be dating my friend/colleague. What should I do?
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