Guys, What do you think she could say that would convince you?

So, a woman decides she will write you a letter, telling you how she feels about you. She loves you, she's in love with you, and finally wants to tell you. What could she write in her letter that would cause you to believe that she does in fact love you/is in love with you? Like in detail, what could she actually say that would prob make you think hmm, wow... yeah.. she truly loves me, is truly in love with me... she's being honest.
Guys, What do you think she could say that would convince you?
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