Why did this girl who has begun dating my crush speak with me aside about whether she was stepping on any toes with regard to myself and my crush?

She does see perhaps that myself and this guy flirt occasionally and tease each other and that sometimes perhaps she has picked up on my body language that I may be jealous. Why did she confront me like this?
Why did this girl who has begun dating my crush speak with me aside about whether she was stepping on any toes with regard to myself and my crush?
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