Pensive Mood

I spoke to an acquaintance of mine recently...rather briefly.
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We were talking about anything and everything.
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During which she said "Fred, hate is not the opposite of love, indifference is."
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I thought that made sense. When you hate someone, you still invest some emotions - a part of yourself - in that person, but when you just do not care anymore, then you know for sure that the relationship has flat-lined.
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I just felt so pensive after that.