What was unrealistic was when my husband did not work more than occasional part-time, we were struggling, had no ambition for education, and was not actively pursuing full-time work. That happened for many years but I told myself that he did have a severe auto accident where they had to rebuild his hip and he was in pain doing what he was used to doing. Thankfully now, he is working full time and pulls overtime when it is available. But he still does not make near what I make. Do I fault him for this ... no. He is making a huge effort toward the family finances compared to what he did in the past.
Not everyone is ready for a college education. Give him praise for what he is able to contribute.
There are some people who go into a marriage and tell their future spouse that they have expectations for them to be the breadwinner. I give them credit for being honest in the beginning even though I don't think this will set up a couple for a long-lasting relationship especially when hard times hit. I don't think this is an expectation one should have after being married though if it was not an expectation before now.