Dear Thalia,
I'm writing you to apologize for being one of the people your boyfriend cheated on you with, but I really did love him and I was willing to do anything to keep him around.
I'm glad I didn't break you two up, but I'm also glad you realized he wasn't a good person.
I'm going to change the subject a bit. I'm not sure if you know that I am bisexual, but I am. And I have an extreme attraction to you. You are so sexy, and the first girl I've ever wanted to do more than just hook up with. I actually kind of want to date you. I really like you.
I know you are bi, too, so maybe you could give me a chance, considering guys don't really seem to be working out too well for either of us. I don't really have any more to say.
Love, Kendall