Whenever you feel the marriage is hindering your life not helping it. Or when your husband/wife cheats on you.
i believe that would be the best solution,if your wife wants to be seperated.
First of all, sexual orientation is unchangeable. If a man is bisexual, then he will always be bisexual. Secondly, a bisexual man is by definition fully capable of loving his wife and being attracted to her. But if the man is actually gay, then that is a different matter altogether.
I guess he feels somehow his wife is doing him wrong or not putting out enough sex for him. Or it could be that he feels if she doesnt know about it, it is okay.
UNFAITHFUL starring Diane Lane and Richard Gere
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.
Yes; some wives do.
Your wife cheats on you with another man. Your wife cheats on you with another woman. Your wife cheats on you with a dog. Your wife cheats on you with a horse...
Ever heard of alienation of affection? A wife can sue the husbands mistress if mistress knowingly has an affair with your husband knowing he is married.