1) This is good to me. = In my opinion, it is good. (generally) This is good for me.
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I look at it this way. A single woman involved with a married man may say “He is good to me.” as the gifts and attention make her happy.
But if her goal is to become married then the relationship with an already married man is NOT good for her. As the married man who is being good to her already has a wife.
Subtle difference but with serious life altering consequences