My exboyfriend new girlfriend (now wife) still keeps tabs on me? why?

10 years ago my boyfriend and I broke up, in a short time he started dating another girl and moved to another country with her.

5 years later he returned to the country, and the girl stalked my social networks almost daily, I made them private and forgot about it.

In 2020, I started a small business and the girl, who is now his wife, buy my products and is my best customer, she insists on picking them up at the store and ran into me… Does she like my products or is she obsessed?
My exboyfriend new girlfriend (now wife) still keeps tabs on me? why?
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