In a previous episode, O'Malley's character Burt told Finn (Cory Monteith) to leave his house after he heard him making homophobic remarks to Kurt (Chris Colfer).
However, O'Malley told E! Online that Burt and Finn may reconcile during the second season.
He explained that the third episode will be "another emotional, emotional episode" for Burt and Kurt.
"The last time I was on the show, [Burt] threw Finn out of the house," he continued. "There [may] be some resolution there. One of the things I think is really important in life and for human beings is to forgive and be able to rise up from our mistakes. I'm hoping that Finn and Burt are able to cross that chasm."
The second season of Glee premieres on September 21 on Fox.
> O'Malley promises heartbreaking 'Glee'