My ex jumped onto another girl after perceiving an emergency trip I had to make, as abandonment. I guess he justified it to her, and she swallowed it hook line and sinker. I'm moving on. It's been a shock, but I am glad to be free. He is chasing her full-on, and I'm still flabbergasted at the speed and a complete lack of conscience- no regret or consideration even after 6 years of being through thick and thin(as it is with BPD). I was undeniably his FP before her. I confronted her too but she is defensive of him. I'm just wondering if such relationships work out in the long term, or, if self-awareness ever comes to them, of how they acted on delusions, and have caused so much pain to the person who always stood by them? Any regrets?