Colleagues still hanging out with my abusive ex?

So I was together with my ex for a year, he was really mentally, emotionally and verbally abusive. We met when I started working at his workplace, we worked together for 6 months and when I started he had already been working there for 6 months. He quit his job and got another job but always remained close with our colleagues. I got really close to my colleagues and cared about them a lot. Last February he cheated on me, with a girl from my work (or at least he tried to). I found out during my shift. I quit and talked to all my colleagues and explained to them how badly he had treated me, the abuse, cheating esc, and they were really compassionate. They saw how hard all of this was for me and how much it affected me. But I recently saw on my colleagues Instagram story that some of them went camping together and he was invited. Is it unfair of me to be hurt by it, and perhaps a little betrayed?

Colleagues still hanging out with my abusive ex?
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