You don't have to act the way you did before, Red. People change, and events can break us down or build us up, that doesn't make you any less you. I know the impact from our memories is important... You are acting differently, but you're still Red.
Be the way you are right now. Listen to your heart and act the way you think is best, if your memories are steering you wrong then listen to your feelings. Because this way is worth just as much as the way you acted before.