Why do women seem to want a guy when he already has a girlfriend?

If she can get you to cheat on your girl this feeds her sick deranged ego.  She feels that she's out done another woman which means she must be sexier.  It a sick and stupid thing to do.

Get out forget him and move on with your life without him as you will be better off.

Human nature.  

We tend to want more what we think is going to become (or has become) less available or unattainable and tend to be more indifferent about what is readily available.

Examples: 

1.  Toilet paper does not excite people much.  But back in the 80's there was some temporay shortage and it caused people to buy it like crazy. 

2. Same for Potato Patch Dolls and other toys when there is a run on them at Christmas time.

Also, most people don't care about pennies, but if a penny is one of few (ie rare) people will go all out to get one year and type of penny and pay more for it.

This is used in sales all the time; sales people using this human nature tendency like this:

"The price was just reduced on this one, and I think it should be sold by end of today, if you want it, you better not wait".

"I think another person I showed this house to is about to put in an offer, so I wanted to let you know in case you really want this house".

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I think she sort of felt like she could have you if she wanted you (consciously or even subconsciously) and then suddenly that "car was off the lot, SOLD and gone!"    Uh oh!

Understandable if you think about human nature.  She thought you were on the shelf (on the lot) and available.  Suddenly you were NO LONGER on that shelf.

However, to quit speaking to you over it, is very IMMATURE and unreasonable behavior ... she's pouting like a young teen!   maybe she is a teen, but I mean like a 13 year old!     

Be forewarned, unless she is real young and mautures, you might see the kind of behavior from her indefinitely if you form a relationship with her.  A "pouter", not a "communicator"

Talk to her about it but be careful about trying to work both ladies at the same time or you could lose both; that's playing with fire and you can get burned.

rob

shortly among the other reasons it is because a man with girlfriend has been shecked by this girlfriend as worth of being boyfriend. we women are very choosy about mens qualities.once one of us picks one of u for boyfriend it prooves that he has been shecked and approved as good quality man by that woman.

there are other reasons.u should read a book about this.not all women know it all like i do cos i read a lot and am 62 so they will not be able to tell u.nor yr mom nor sis nor friend.only trained people like sociologists psychologists and generally people whos schooling and job is this theme.ie why women chase men insted of the other way round as in animal kingdom and why men are in more demand than male animals where the situation is biological.females are in more demand cos each female can hve only one child a year and usually not more than 15 children in life time while one man can fertilize 5 women daily.so cocks are being eaten and only one in 7 is preserved for fertilization of hens.cos hens make eggs.egggs are children or good to eat.so each hen is precious but only one cock in 7 is kept alive.why there is thesame number of cocks and hens being born from eggs then.cos the cocks will fight wnd whichever wins the remaining 6 is the best so he is the best father of all children while each henisprecious.the same  counts for females andmale humans...andso on and sofourt...why should i sit here for hours at my computr paying internet to tell u what i learned reding many books.so go to the best book store u can find and ask for books on the subject tht a psychologists with sexual orientation in his her job will thell u the title.read and then do what the book says. of course yr friend is an idiot but the book will tell her where she made a mitake and why she made it. but who cares for her.she had her chance with u blew it the yr girl recognized yr value and everything is ok with u and yr girl but not with yr friend. leave yr friend.