When a member of the opposite sex rejects you emotionally by being brutally honest, yet is not saying it to hurt you intentionally because they do care to some degree and are a good person. They have inadvertently caused you emotional pain by their brutal honesty.
When he said he wasn't in love with him, he dealt him an inadvertent emotional bitchslap.

When the loving husband said she looked like she had gained some pounds during her pregnancy, his wife received an inadvertent emotional bitch slap.
by Blondefire36D June 2, 2010
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