Is it possible a man regrets choosing another girl if in spite of the fact he is dating her he is always staring at me when we’re out socially?

He even said in front of her that dating her was a white lie and winked at me. And I catch him staring at my body. And staring intensely at me, trying to catch my eye, he teases me, he looks into my eyes deeply, looks at me when he thinks I’m not looking, etc.
Is it possible a man regrets choosing another girl if in spite of the fact he is dating her he is always staring at me when we’re out socially?
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