It’s uncomfortable to deal with a person who makes us feel awkward for no real reason. And lack of reason might be the clue. Occasionally, the past can color a current moment in the wrong way. So when the chemistry seems off, we can ask ourselves if this person reminds us of anyone we’ve had a bad episode with, and whether we’re assigning him qualities he doesn’t deserve. If so, we repeat to ourselves: That was then, this is now.