What is it with men who are in a relationship and just go on dating app with "looking to date"?

And keep liking you on the dating app "as if you don't know".

But even when he was single he never talked, only stared,
looked at me weird when I hold the door open (just me being nice, not flirting. Also do it for others)
After all that still stares at me. Others notice it too and I look away when they told me he stared at me. I didn't want to bring him ideas.


However all that..
how is that normal in this generation to be in a relationship and also online on a dating app?
Does he miss the attention from other women?
What is it with men who are in a relationship and just go on dating app with "looking to date"?
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