I don't blame Victoria F for getting upset and crying, but I do think her mean and argumentative tone was inappropriate given the situation. With what Peter was asking her, I would have expected one of two reactions: 1) her being astonished at the accusation, explaining its not true, explaining how she knows Merissa (the ex) and where things may have been misconstrued, reiterating her love for Peter and how she's been honest with him, etc. etc. OR 2) her admitting her role in what Merissa accused her of, having a contrite tone, apologetic for not explaining her past, offering an explanation. Tears in either of these scenarios is totally understandable. But instead, Victoria deflected by creating an argument, turning it around on Peter, and then the root of the conversation got lost in their war of words. She manipulated the whole situation so she didn't have to address the true question at hand. From my perspective, her reaction was immature because it seemed to me Peter was asking her for clarity about a serious accusation, which is actually a mature thing to do, since communication is important in a relationship. There's no way Peter could not have blindsided her because it had never been spoken about, and Peter was also blindsided by it himself. Even if Merissa was just stirring up drama and completely fabricating everything (which she wasn't), I don't know how Peter could not address it with Victoria since its so serious.