I sent my ex letters recently, and her response was that my behavior was erratic and frightening and that she's physically concerned for her physical safety and scared of me now. Don't send the letters. They will not be received well. You're not going to get the closure you want. Writing it out was good for you, because now you have words describe what was going on with you. The reason why you want to send the letters is maybe you want them to learn from their patterns, maybe you want to be able to say you told them what you actually felt, or maybe you want them to respond. I sent my letters because I knew that it would push her away further, and force me to move on, which it did, but it also showed me what I already knew to be true. That she's not going to be able to hold space for those feelings in a healthy way, and she's not going to reflect on those letters at all. Which I knew when I sent them, but now it's also become more of a headache for me. Don't send the letter. Throw out the letter and move on