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You should think about the question "Do I want to destroy a relationship for my own favour?" and than again "What would I feel if someone steals my girlfriend which I love and maybe plan a family with".
In my opinion, tackeling working relationships is a moral crime.
True.. breaking up a great relationship is a moral crime. But remember that women will always go for something better if it comes along, so I would advise not to if you're only interested in bedding her. If you actually want this girl and you can break that connection with the BF, then by all means go for it. Just be prepared for the reprecussions of your actions. To break this up, you need to cause doubt without a direct assault on the BF and make yourself more interesting in her eyes. Just browse around the forum for ideas.