I've met the woman I want to spend the rest of my life with.
Do you really think you found the one?
I was in a relationship before and I don't want to think about my past in order to be in a better future.
Finding the person you want for the rest of your life is a good feeling. Leaving the past behind to create a better future is admirable and exciting.
I don't want to talk about my past.
I get it, your past is your own and you want to leave it there. It is great that you found the person you love the most and I hope you two have a very happy life together.