So Marshall gets bounced around in the corporate world, settling at Goliath National Bank with Barney Stinson, and what do you know? He likes it there! Yet, when he breaks to news to Lily that he wants to stay on at GNB, she reacts as above. "Why aren't you my hippie boyfriend from college?" First off, Lily's debt is the reason he's on the corporate track, and it doesn't look like her lifestyle changed much, so assuming they're still paying off their mortgage with 18% interest and her lifestyle, Marshall needs a high paying job. And then she guilts him for liking his job.