It's pretty obvious that he is the ML. We all see how he suffered when he was a child so Adult version doesn't know how to communicate at all. Misunderstandings, misunderstandings. All I know is they clearly loved each other but missed the opportunity to show it.
One thing I'm curious is, she looking forward to find her children so the second husband probably have big role in this. She may want to end up with second husband to give life to her first child. I dunno how the author will play this story at all.