My STBXW and I have been separated for a little over a year. Divorce papers have been filed. She entered the dating realm a few months ago and has been with several people already sexually. I know we aren't together, but given that we're still married it still feels like cheating to me. And I'm having a hard time processing the fact that she's enjoying someone else other than me. We were each other's first for everything. Just hurts.