They are talking about how he abandoned his wife, and son, when he found out Jean Grey was alive. To put it simply, he has a history of being a shitty husband.
Becoming a father was not the single greatest moment in Scott’s life. At least, not at the time.
Madelyne wanted him to leave the X-Men, becoming a family man. Scott wasn’t hot on the idea of becoming domesticated, and wanted to stay. In fact, he felt the X-Men needed him. Real problems arise when your whole identity is carved out of your career choice. I do not think he was able to comprehend a life that did not also include the X-Men.
Madelyne’s appeal to him did not work. He would duel with Storm for leadership, and lose. Partly because his mind was distracted with conflicting loyalties, but mostly because Madelyne was subconsciously playing with his head.
He left the X-Men, and joined Madelyne in Alaska, where they would start their new lives. That wouldn’t last long. The quiet life chafed at him, and
his relationship with Maddy was deteriorating fast.
The writing was on the wall. Let me be clear on this,their relationship was doomed. There was no real possibility of long term happiness for them.
But then the 10 ton brick broke the camel’s back.
Jean was back from the dead. This whole runner up life he had been living was no longer tenable. He left his wife and son alone, for the only life that made sense for him.
He would eventually grow into the role of father.
But the scales were never balanced with Maddy
Scott’s has lacked the ability to manage his personal life near as well as he has the X-Men. He put everything into being Cyclops, leader of the X-Men, while the individual man was very flawed. Complications became exponentially worse when those two lives clashed. He fucks up, and falters. This episode, and the failure of his marriage to Jean would put it in glaring focus.
He is more than a little selfish as well. He becomes racked with guilt, but this has not stop his course in time to avoid hurting those he loves. Personally, I think he thrives on the guilt, and uses it to drive him forward. It is definitely the case in regards to Charles. In the last few years he has become more comfortable with Scott Summers, the man. Hopefully he will be able to handle the next major life test better.