The actor admits it was ''hard and emotional'' to say goodbye to both the actor - who overdosed on heroin and alcohol in July - and his character Finn Hudson in a one-off episode, but says the tragedy has brought them all closer together.
He said: ''We've kind of got over that hump of the Cory tribute episode. I'm so happy we did that, it was incredibly tough, hard and emotional for everyone but we all came together, we were happy to be on the other side of that.
''We're a family and we all have a great relationship with each other, but that just really solidified us and made us stronger.''
Matthew was scheduled to play a concert the night he heard Cory had passed away and though he considered cancelling the show, he was happy it went ahead as he found performing ''therapeutic''.
He explained to Britain's OK! magazine: ''I had two shows after he passed and thought about cancelling them but I didn't want to let people down, I didn't think Cory would want me to.
''The shows were so hard to do but I'm happy I did because there is nothing more therapeutic than singing.''
He also slapped a jet-lagged Taylor Hawkins.
The acclaimed performer had just cancelled touring due to a battle with cancer.
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