1. How much blame or responsibility does the 3rd party share? Assume 3rd party was single, but knew that the person they hooked up with was in a relationship.
Absolutely none. This is something unfortunately not many people understand.
Person A and Person B were the only people with "agreements" to be exclusive. If one of them strays, it not is not because of the wiles of the newcomer or any convincing they did. It rests absolutely on the person who has commited to NOT cheat. If B has decided to fuck her best friend, it is B's fault for breaking the agreement. Unless Third Party had an agreement with BOTH A and B, he has no moral obligation. He is not party to the agreement. If my girlfriend were to hypothetically go and ravage some stranger, I have no right to be mad at the stranger. He had no agreement with HER OR ME to avoid having sex with her. The only one who had that agreement is my girlfriend, and she would be on the recieving end of the ire.
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2. Are there mitigating circumstances for the people involved in the cheating? What if 3rd party and B had been in a relationship before? What if there had been a past history of hooking up between 3rd party and B?
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2, 3, and 4 are all irrelevant. Although, it sounds entirely like you're trying to defend an action you yourself feel is wrong. If YOU think what you did is wrong, making excuses for us to agree with won't help you a darned bit.
Put simply (A+B) + C. If at any time it becomes A + (B+C) or B + (A+C) it is the intial parenthesis occupants who are at fault, not the additional operand.
Frankly, I don't think people trust their SOs enough. Why in the world would you be mad at someone if he had sex with your girlfriend? She is the one you trust to not break the relationship. If you're really so insecure that your girlfriend can be "stolen" by another guy, then you're not worth much.
Then again, we know where being frank gets me.