When you think of another man and you are married, it simply means that you like the man and you at least have some feelings for him. You should avoid any activities or meeting that brings both of you together. You need to distance yourself from him because one thing always leads to another.
Well that means that you need to stay away from that man before you do someting that will mess up your marriage. And if he doing what your husband aint doing he just tricking you to make you fall in love then you gone looking stupid.