You are wildly fascinating, but you are not for me.

If I led you to believe that I wished to marry you, pray forget it.

We should make each other unhappy and, worse still, uncomfortable.
"Do I make myself clear?
We are not engaged.

I hope you will marry Arkwright; a fine fellow, in every way suited to you, and, I happen to know, madly in love with you.

Please try to forgive me.