Archenemy's Deceptive Love

Archenemy Lost Her Memory, and I Tricked Her into Being My Wife
I cooked soup for her, fed her meals, and even warmed the bed to sleep with her.
She thought I loved her deeply.
In reality, I was secretly taking over all her business behind her back.
Just as I was gloating, I unexpectedly overheard her on the phone in the bedroom, her tone both coy and angry:
'Give him a bit more business, will you? He didn't even sleep with me last night!'