hey all! hoping you guys can help me find the name of this manga

I only remember this one scene. They are at a restaurant or somewhere else having dinner and the woman is suddenly acting like a b**** so that the guy will break up with her cause she found someone else that will support her and her son financially.

Both of them are adults.
Both of them work in the same place.. I forgot where but they met at work.
There is an age gap.

Thanks guys.

Can you remember or take a guess on 'tags' or 'genres'? Also around what time where you reading it as in what year did you come about it?

It sounds familiar I think.

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