During the COVID-19 pandemic, you might be feeling disillusioned with some of your friendships. But, there are many possible explanations for why a friend has been out of touch.
People who have bipolar disorder can have periods in which they feel overly happy and energized and other periods of feeling very sad, hopeless, and sluggish. In between those periods, they usually feel normal. You can think of the highs and the lows as two "poles" of mood, which is why it's called "bipolar" disorder.