By how she acts when she is around him.
ANSWER:
The only way a wife can go in that direction, liking another man is if her husband is not paying attention to her. Or her husband is been taking advantage to everything she do for her husband. My only opinion.
Tell her to bag up of your man
tell him to chose who he likes best or if you want a man who likes only you then say go chase after that hoe you like.
He can still love his wife and tell another lady. Men are strange... don´t you know?
you can tell if his penis moves when hes around you
Yes. You made the mistake, so you should man up to it and confess.
that depends if his wife is ready to move on from the marriage.
Cause he is sexy!!
he gets a boner
ask him for money
He will look or stare more than just a second, he may try to talk more than other men.
You can never tell but if in doubt just talk to her and reasure her that you love her more!!!!!!!!!!
Do put pressure on her, and do not have her do everything for you, another thing is, read your Bible, the Bible can also tell you how to be faithful to your wife, read the Bible together, and pray together.