Respect. The one thing that the LBS cannot have from the WAS/WS. The sad truth is they do not really care that you are the father of their children any more than they care about saving the relationship. The legal obligations regarding parenting/co-parenting are all they will (hopefully) respect, but you as the LBS will not and should not expect any respect.

I know I do not expect it from my W, and my sitch does not even involve an OM. I have reached a point of hopelessness in my sitch. I just feel numb right now.

Just worry about your side of the street, as mentioned above. Just worry about your time with your S3. You cannot control what she is doing and you cannot be there when she has him. You have to let go when S3 is with her and hope for the best for S3. Forget any expectations you might have about how you think she should treat you - as S3s father or not.

M: 40 W: 37
T: 20 MR: 13
S13, S9, S4
BD: 1/29/18
Sep: 4/23/18 (I moved out)
8/24/18 I come home, she moves out

If you want to get out of the hole, drop the shovel.