I need to apologize for my behavior this last {amount of time}. I know that I can be paranoid, clingy, and jealous sometimes, but accusing you of cheating really crossed a line.
You are a wonderfully supportive, trustworthy {boyfriend/girlfriend} and my past experiences shouldn't affect how I treat you. It's hard for me to trust, and I promise I'm working hard to overcome my conditioning and instincts. I'm sorry that you have to suffer for it when you've never given me any reason to doubt you.
Love,
{Name}
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Index of letter of apology templates