Blaine is panicking. His mother is coming to see him in New York today. And he never saw his mom in a long time. His mom doesn't know he's gay and has a husband (Blaine's mom really doesn't support the gays). And Blaine has been getting a bit fatter than before (which his mom probably would hate to see)

Blaine walks in circles trying to calm down "oh god my mom's gonna kill me!!!"