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at this point just tell him u already have someone u like
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She shouldn't even need to lie bc that'll lead to more complicated matters like proving it. At this point she should just be blunt and be like "Why you want to keep the marriage even though you have someone you love? Huh? Oh, you want power from the marquis? Oh so you don't give a shit about how I feel, huh? As long as you be happy. Your feelings is more important than mine. You don't care about me being in this marriage miserable from having a husband giving love to another woman. Now what if it's the other way around? But since it not the other way around you don't care. As long as you are happy, who gives a shit about other people—" and so forth
Fucking bitch