So me and my ex (who has bpd) started dating again back in late august, I knew she was with someone else during our less than 3 months apart, I wasn’t, just worked all the time. She got a message from the person she hooked up with on September 1st. She had claimed originally that it was a 1 night stand and that it didn’t mean anything, but the screenshot she took of the persons message paints a different picture, she now claims it was a weekend and it meant nothing to her but the guy had heart emojis, talking all deep and stuff, it wasn’t nothing to him. I just seen the screenshot, confronted her and she split mid argument so I had to shut it down, I did not yell or raise my voice, I was totally calm. I want to finish talking about it so we can bury it finally but I don’t know how to without triggering her again, any advice?