I keep unpicking old wounds!

Why do I keep going back months and months ago and punishing myself for saying things to an attachment figure. Even though I know I have had positive conversations with this person since I still continue to beat myself up about things I have said that may have upset them or did not receive I response. I continue to worry that this will effect the relationship and cause them to leave me or see me differently. I convince myself they are thinking I’m a pain or make things worse for them! I just can’t seem to let it go and stop berating myself!
Negative self talk: “ why did you say that you idiot” of course you should have known better” no wonder they think of you this way” “you ruin everything you make things worse”
How do I let this go!!!