Is it possible to change your opinion on a relationship you've had in the past, whether you were in love, etc. if the relationship you're in now has changed your outlook on life?

I question what my relationship with my ex was based on since my current relationship has made me reevaluate my values, what I feel is important, etc.. When I look back on my past relationship I feel as if I was extremely naive and immature. I would have described conversation I had with this girl as magical, but the person I was in that relationship is different from who I feel I am now. Is it possible to change your outlook on who you were based on who you feel you are now?