He was seeing her while seeing me and I only found out afterwards. But still, seeing him kinda makes me angry, I despise him and he is a narcissist. He brings her home everyday so I get to hear whatever they say or do. I cut all forms of communication with him, I don't say hi, I haven't looked at him in like a month and that's it. Most of the times I don't care but then there are moments where memories come to mind and it hurts. Any advice?