1. Married men
It’s obvious why dating married men is a bad idea. Falling in love with a guy who already belongs to someone else entails countless painful sacrifices on your part: You cannot have him all for yourself, you have to keep your affair a secret, you can’t be seen together in public, and he can only call you when he can find the time away from his family and friends. Not to mention all the potential stigmas that could plague you if your relationship is exposed.
And you have to recognize the real possibility that after all that you've gone through for him, he’s not even contemplating on leaving his wife. "Although some people do find the love of their lives whilst they are still with someone else, a good rule of thumb is that if someone doesn’t leave their marriage within six months, they probably never will," says Helmanis.
The only married man worth considering? He’s the one who tells you to leave him alone and he’ll find you if/when he leaves his marriage, Helmanis adds.
This guy takes an interest in everything you do, from the way you dress, who's in your phone list, the way you arrange your room to how your friends treat you.
At first it may feel wonderful to have this attentive man who genuinely cares about what's going on in your life, "but pretty soon he is telling you that you fold the laundry wrong (although he never does any) and that your best friend is boring (he doesn't like anyone else to have any influence)," warns Helmanis.
More info here: http://www.shoppinglifestyle.com/love/article.asp?id=726