33yo checking in
I've had every conceivable type of relationship, I was engaged once, but never married.
The best thing I ever did for myself, was read this book:
The Rational Male: Rollo Tomassi: 9781492777861: Amazon.com: Books
Which introduced me to the various concepts that comprise the mindset usually referred to as the "Red Pill" or RP. No, its not pick up game crap. Its pretty involved into the psychology of men and women and attraction.
It will help clear your mind in the short term as you get past the break up.
He also has a blog, and a 2nd book. But start there.
There is no such thing as closure, honestly. When someone says they want closure, its more of way of saying I want another conversation for another chance.
You can't negotiate attraction. Do you really and truly want to convince someone why they should spend time with you, or would you rather meet someone who values you and the same way you value them?
The vast majority of relationships in life are about loss; parents, spouse, whomever. The sooner you learn to manage it and operate with your own personal frame and goals, the strong you will be and the more fulfilling your life will be.