laugh and the (whole) world laughs with you(; weep and you weep alone)
People like to be around those who are happy (but not those who are sad or morose). I know he's still hurting from the breakup, but John's misery has made him really hard to be around. Like they say, laugh, and the world laughs with you; weep, and you weep alone.
Laugh and the world laughs with you; weep and you weep alone.
Prov. When you are happy, people will want to be around you and share your happiness, but when you are sad, people will avoid you. Nancy: When Harry and I were dating, all our friends invited us places and called to say hello. Now that we've broken up, they treat me as if I don't exist. Jane: Laugh and the world laughs with you; weep and you weep alone.