Is" I don't want to ruin our friendship" a valid defense?

I don't want to ruin our friendship line really a valid excuse? I don't think many people retain most of their opposite sex friendships after they enter a serious relationship. Not always true but a lot of partners won't understand a closer relationship with a member of the opposite sex. So is it a valid excuse? I don't want to ruin our friendship"
Of Course It is!
No that's absurd!
I have no Clue
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Is" I don't want to ruin our friendship" a valid defense?
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