How do you deal with someone who's constantly trying to get under your skin?

Working where I work, I see a lot of people. Including my ex girlfriend, who I'm convinced only comes into the store when I'm working and always stands in my queue to try and spark a reaction from me. She always buys one thing, and she's borderline making out with her boyfriend when they get to the counter

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curiosi · 61-69, F

It really once bothered me. I mean really "You have to make a project out of trying to get to me?". Then I realized something, they are doing it because I am living rent free in their head. That's a hell of a lot of power they are allowing me. So I return the favor by ignoring them which drives them nuts.