My girlfriend (26F) and I (25M) started talking over long distance for a month before our first meeting and officially got together after a few days during her 10-day vacation. Early in the relationship, she confessed that she had an affair with a guy (25M) I'll just call Coco. She told me that for so long, she tried to end her relationship with him but had a hard time as she got real attached. According to her words, she finally ended her thing with Coco around a month before we started talking and that she blocked him on all social media. Fast forward to now, I found out on her phone that she messaged Coco twice last December: one was checking if he blocked her, two was greeting a merry christmas and a delayed happy birthday as it was their promise.
Moreover, I found out that the day before our first meeting, she had plans to spend the night with Coco at a hotel immediately upon her landing. Whereas she told me at the time she would meet her girl bestfriend at the same hotel. And according to her conversation with the Coco, it was to create memories before they finally part together.
Still haven't told this to my girlfriend as she's away from work. Any advice?