Our expert says:
you have two dilemmas here
1. a so-called best friend who makes out with your gf
2. a gf who has cheated on you and is prepared to do so with your so-called best friend
major elements of trust have been broken and you have to be really honest and ask if you can ever really trust either one of them in the way you did before. if not then you will always be doubtful in your relationship which will never have a stable base and also in your friendship.
to be honest when trust has been broken like this my advice is to move on - they have done this once (that you know about) and could well do it again. i would also suggest you find yourself another best friend that is trustworthy, he clearly puts the contents of his pants before your friendship!! difficult choices i know but ones that in the long term will serve you better.
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