Confused and need advice

My husband drives a truck for a living and I've recently realized I really like his partner he drives with. His partner is married also but getting ready to go through a divorce. I don't know if I should say anything to my husband because he would tell his partner and it would probably make things awkward for all involved but I don't think it's fair to have these feelings and not tell my husband. To make matters worse I was informed that a relative of mine is planning on going on the road when my husband is on vacation and I know she will try to make a move on his partner which will hurt me but in all fairness she doesn't know how I feel because she will tell my husband and his partner. So I'm really confused on what to do.

Why would you care if your relative is going on the trip? You're being jealous over someone who is not yours in the first place. Difficult choice......are you sneaky enough to have a one night stand to get it out of your system? Is it worth it if you get caught? Do you have a guilt complex? Most of all, how do you know if this guy even likes you in the same way? Telling your husband would be dangerous ground if you intend on staying with him.