Uh, hey cjjulie, before you go leave your husband because of what some hippie told you on the internet
, let me play Devil's Advocate.
Don't forget that you don't get the time to get to know this person like you did before you married your husband. A relative of mine did that--left a reasonable marriage for someone she instantly clicked with, felt that she
would fall madly in love with him, and only a year or so later realized this guy had all sorts of dealbreaker faults that she would have seen had they dated, but because it was an affair there was no time to genuinely get to know each other, and now her marriage was gone and she was miserable.
Judge your marriage based on itself, not compared to what you think might happen with someone else.