Dear Eric: You’ve received numerous letters from those who say their gestures of friendship are not reciprocated. Some friendships, like the example by “Uncelebrated”, whose friends didn’t recognize or celebrate a cancer battle, have spanned weeks, months, or even years of a seemingly one-si ded promotion of the relationship with the lopsided sacrificial investment of time and energy. It boggles my mind that I have yet to hear two possible explanations: One, “introvert” versus “extrovert” personalities. And two, that the unresponsive “friend” doesn’t enjoy their company and would prefer to not meet with them. ...read more read less