United defeated Blackburn Rovers at Ewood Park with two late goals.
"At half-time and at 60 minutes I thought, 'You never know'," Richards told the Daily Mail. "But United do always look like they will score. So I knew it was gonna come. But when they got it and went further clear of us, I actually wanted to cry and I haven't done that or felt like that in years. Football is full of emotions. You get angry and happy but I have never wanted to cry before.
"This time I did as that is how much it means. I have been grafting so hard this season, we have played unbelievable football and to see United come like this is horrendous. It kills me. I care so much about how I play and how we do in games. If things go badly in a game, I just can't sleep."