I think it's a fine line with the kids and what to tell them. Based on seeing what my MIL did, (she never let him know why she went back to work full time and why father was never around when he was younger. In fact she would constantly say things like "your father is a great provider. He worked all the time to provide for us". .even when husband was older, over and over, and over in a really weird way). And then he tried to reproduce a unhealthy enabled relationship.
I want my sons to know that their fathers decision is not a normal or acceptable way to act so they don't repeat the cycle, but I don't want them to think they are rejected by dad either.
Me: 42 H: 43 Twins age 5 Physically Separated 7/2015