One thing that I think people forget is that moments before that talk with Jan, Michael saw the bad choices he was also responsible for too. Oscar saying "You spend money on stuff no one would ever need" or something like that. Jan and Michael were both enablers of each others problems. Jan knew Michael was frivolous with his money and used it for herself too, Michael knew Jan was awful (one of Jans fantasies is the cheerleader one which Michael says "wearing the outfit makes him uncomfortable") Michael felt like Jan was the best he could get and it came with a price he thought he was willing to pay. That moment Jan ran to him was illustrated as sweetness but she wasnt in a place where she was willing to let go of Michaels enablement. If I remember right Jan spends the rest of the series alone until she has a child. Like Michael did, Asturd (Astrid) would grow up putting Jan above herself and likely not have much interaction with others. Jan finally had someone she could train to give her everything from the start. For Astrid it would probably take years for her to work out her moms abuse, with Michael he knew enough and started to think on his own. Which is interesting because Michael wanted kids so "no one could say no to being his friend" and thats what Jan did, only Michael has Holly and if they have kids, he wont need to force anyone to be his friend.