It's possible the feelings will pass. It's also possible the feelings will become more intense and lead to greater temptation. You have to decide if you are okay with taking that risk. Would your husband be okay with you taking that risk if he knew?

Also, think if the situation was reversed. What if your husband had a close female friend and developed a crush on her? Would you consider it harmless and assume it would pass? What actions would you hope he would take?

Another thing to consider is the setting in which you spend time with your crush. Are you always in company with others when you socialize? Or do you tend to spend time alone together?

Personally, I wouldn't want my wife to spend time with another man that she was developing feelings for. Especially if they had a long history of friendship together. It's too easy for friendship to become something more. I would venture that most romantic relationships begin that way in fact. I realize a crush can seem harmless but it is still a risk especially with someone you trust and feel comfortable with.