Are you just looking for solidarity from other people in weird relationship situations? As you seem quite accepting of it all!
I agree with others, the manipulative ex who is (allegedly) withholding contact unless he stays at her home is going to be a problem long term. Even when he moves out again. He needs to sort that shit ASAP!
If you want to have a look for my thread on a similar issue feel free
My DP’s ex doesn’t live there, but she may as well do given how much frigging time she spends there.
For me it’s not about sexual infidelity, it’s about familiarity, boundaries, having a place in his family etc. There’s a territorial element to it, that regardless of how much he reassures me, or how unlikely sex might be between them, it’s watching the way they interact - the years of ‘shorthand’ and memories, the DCs that display traits of them both, a physical reminder that they DID USED to have sex! Even when he’s annoyed by her, the fact that she still has any impact on him gets to me!
It’s hard. Having a relationship where there’s another person loitering in the background or loudly in the foreground most of the time is unnatural.