Until the Duke begins Unrequited Love

When transmigrating into a villainess, the number one survival rule to follow is ‘Do not fall in love with the male lead from the original novel!’
I was trying my best to survive… but the male leads are fiercely getting in the way.
“Do you know what I went through just to marry you?”
It’s not poison; it’s a marriage proposal.
“Even though you’ll never love me, I still love you.”
It’s not a threat; it’s a confession.
“If you won’t kiss me, don’t come any closer.”
It’s not a blade; it’s lips.
Can I really not fall in love?
I did.
Moreover, it’s damn unrequited love.
Let go, you see; that person fell for me first, okay?