What are the signs your ex still has feelings for you even though they say they don't?

Anonymous
Like the question says what are the things an ex would do which would indicate they still have feelings for you even when they say they don't?

My ex of a few months, who I dropped because she was playing games and being manipulative, started doing the following even though she told me she has no feelings for me:

Giving me the silent treatment but always seemed to be staring.
Always hanging out at the place we frequent.
Constantly being in proximity but somewhat distant...if that makes sense.
Flirting with other guys infront of me and being really loud.

We haven't seen each other for months, but now she's making her relationship with her new boyfriend very public on social media when before she was always very private, I mean she barely shared anything on social media now there's pics everywhere and emphasis on her relationship status.

Should I take this as a sign of punishment, attempted jealousy, attention seeking, leftover feelings or what?
What are the signs your ex still has feelings for you even though they say they don't?
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