Dear {Name},
I've been thinking a lot about what you said, and I see now how incredibly wrong I've been. I know I've been moody and angry and abrupt with you, and I didn't understand it until you pointed it out.
I want you to know that I would never ever be unfaithful to you. I love you so much. I love you with all of me. But what I thought was just a friendship with {Name} was right to create friction between us. I think the feelings that {he/she} and I developed were not as innocuous as I pretended-to myself or to you.
Please know that this is only now becoming a true awareness for me, but that I am so sorry for it regardless. I made you doubt yourself. I made you feel like you were being paranoid and jealous. You were right to distrust me, and I'm sorry for ever giving you reason to.
I realized now that my friendship with {Name} is inappropriate and cannot continue. There is no question in my mind: I will never see {him/her} again, because I don't want to jeopardize the rare and wonderful gift that I have in you. You're everything to me. I'm sorry for ever making you question that.
Love,
{Name}
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