as a bipolar myself, i understand your frustration, only because i have seen first hand what this can do to any relationship, be it a friendship or a romantic relationship. i wish there was some magic answer to this, but there isn't. we are a difficult breed. lol. seriously. best you can do is try to be as patient and understanding as possible, and just try to understand that we don't behave like this on purpose. i know it's hard. good luck.
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friends are like balloons...once you let them go, you can't get them back.
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To the world you might be one person, but to one person you might be the world.