Replaying hurtful words

Hi! I have had very severe OCD for as long as I can remember. However, I think mine manifests differently than conventional OCD sufferers. One problem I have is replaying hurtful (more like vitriolic) words spoken to me. A year ago, someone rebuked me very aggressively and I just keep replaying it, fighting with it, trying to understand why she said it, trying to figure out if her criticism was fair, etc. I froze up at the time and just ignored what she said and closed down the conversation in a very kind and courteous way. I have noticed my OCD tends to linger over words when I never got closure. Do any of you struggle with this problem? How do you let go of what was said?