It doesn't, for her purposes. However, I asked this exact scenario of my DH last night. He said, he would not want this guy in his side for the wedding party, he would definitely not vacation with them as couples, he would not just let it slide and would end the friendship, and he would damn sure want to be told by her, not by someone else later on, or hear of it later on, since now everyone, including the GF, knows but her FH. Men can be pigs, sure, but that doesn't mean we'd keep them as friends.
I don't know what OPs FH would think, but my DH absolutely would want to know and absolutely would not consider this creep a friend. And, if I hid it from him, he'd be angry. OP can't control this now, cause GF knows too.
Finally, no reason I can see for OP continuing to discuss this with the creep, but I also can't see continuing to be friends and covering for this creep either.
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