Should you get worried if your ex is in a bad situation?

Should you get worried if your ex is in a bad situation?
While it was my decision to cut off my ex and my sister with any communication and support, a series of pics of them popped up in my social media feed. In all of them they wear matching shirts, ties and skirts. So I called my sister to enquire whenever they found a job so I can stop supporting them financially and she said it wasn't, they are making a "new life approach" and invited to come over so they could show me what it was about.
I kindly refused and got a bit worried they could have joined a cult or something like that but it turned out it's just their own private little madness.
So now I still stand in my intention on cutting them out of my life but I'm also very worried.
What should I do?
Updates:
26 d
The girl I'm seeing now went ahead and said I should delete my ex's number and keep it cautionary with my sister.
Should you get worried if your ex is in a bad situation?
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