Fool
YES.Cheating is cheating is cheating is cheating. They could be on the MOON and it would be NO different.
If you have absolute proof that your husband is cheating with this other woman then you should deal with your own problems with your husband first and yes, the other woman's husband should know. This is not an uncommon problem and most people (whether a husband cheats with another man's wife or a wife cheats with one of her friend's husbands) is very common and the victim of the cheating generally does tell the husband or wife that their spouse is cheating with their spouse.
It depend to how long and how it started, but yes she needs to confess to this woman. Especially if this woman doesn't know what's going on. And what about the cheating wife's husband, what did he do to be betrayed by her. If the cheating wife and the cheating husband are having a wonderful time hiding their affair, do remember what goes around comes around.
cheating is doing anything you wouldnt want your wife/husband or girlfriend/boyfriend to know about
In my experience, as both a husband and a wife, 100%
You don't. Stay out of it.
No, i remember learning about this in school when i was younger. You are only considered cheating on your wife/husband if you have sexual intercourse with anybody else and not your partner.
No, she would still be a cheating slut.
this is an easy question: see if he goes places alot and be on the phone too much.
He's just not that into you
yes, hes my secret husband hahaha ;D