Maybe it is strong, but I’ve both been in this position and have had plenty of friends in this position. Whatever is going on with him, it’s beyond shady and not something you should be inviting into your life. You stand to lose absolutely nothin by completely cutting him out of your life. I hope you’re able to do it. If I come across as super critical, I apologize. I just have seen this okay out many many times before and it always ends poorly. The biggest mistake everyone makes is not cutting out the cancer before it metastasizes. If he is with someone else, you have no idea what their mental state is or how you could be putting yourself at risk. Hopefully that would never ever be the case.