New here but learning slowly. Advice appreciated

[Albuquerque]

Thank you all for your thoughts. I think you're probably right. No point in going down that road. It's his lie not mine. If asked, I'll say I know. But otherwise, it's in his ball court. The NC is not possible since he's still quite involved with D13. Not nearly as much as he was and he has been forgetful about some of her events, but that's MLC for you. In fact, he's been watching her for the last few days while I'm away working out of town. Unlike many that I read about in MLC, he's always been good with D and has been cordial/nice to me. Sure he ripped my heart out initially and described all my faults while simultaneously saying he knew the problem was him not me...but you still have too many faults etc etc. Other than a blowout yelling argument we had prior to my realizing him MLC and reading DB, we've never argued and he's never been anything but nice and cordial. I'm thankful for that.
Just finished an odd conversation with him too. He'd texted me and asked me to call him when I had time to discuss some stuff. I took my time, ate dinner, got comfortable, and THEN called. We're prepping a house we own for new renters and he was planning on going down tomorrow to work on it. Since I've been doing most of the work, he wanted to get the run down on what remained. I kept it on topic and went over what was needed. I briefly asked about D13 but felt that was still on topic. He asked me how it was going for me and I was vague and said it was all good. Going by DB rules, I determined that all the information necessary had been transferred and wished him a good day tomorrow. He told me he'd probably text or call with questions and I said that was fine. Then when I was exiting the call and actually had said, I'll talk to you tomorrow, he asks me to call him later tonight if I'm not doing anything. I was so stunned by the request that I just blurted out, yeah sure I will.
So that was really weird. It's 830pm my time and I won't be busy later so I'll probably call him back in a few hours since I said I would. I know he was there with D13 and he probably wanted more privacy. Whatever the reason may be, I'm sure it won't be good. Perhaps splitting finances, perhaps confessing OW, something worse? I was planning on enjoying my evening reading, now I've got my stomach in knots. I'm still working on detachment. Gotta work hard in the next few hours. Detach detach.. detach...Where's that book......