Could they still have somethig going on or could she still be interested in him?
No, unless she starts to respond on any other way, even if that other way is annoyed. You are only "over" your ex, if, and only if, you can ignore him/her totally.
That's me, I don't believe in friendship after ex. Or that would not be an "ex" in my book.
Best advice I could give you is to stay away from people who have a messy relationship to their exes.
I would worry
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