What do you do, when you are married or in a committed relationship and you have a crush on someone else?

that is always a hard situation its a good reason to really think hard about your marrige, and hold tight give it some time and think about it some more but before you make any actions or express any feelings give it some time and like i said hold tight and wait.

I would tame the feelings/ avoid and concentrate on hub

Just stop and examine reality with a bit of Logic and Common Sense
Fantasies and Feelings will fuck you up... and your life thereafter
Sex and Dreams are too fleeting to change your life over thoughts about them

I probably take it farther than many emotionally but I don't think I have committed adultery yet.

First, negotiate a set of rules with the other person. Then think it through.

What did your husband do?