Ended engagement, Ex fiance... feeling sad after 2 plus years

I ended my engagement a little over two years now. I'm now in a new relationship but I refused to throw any of my stuff with my ex fiance, like cards etc.

Sometimes I get flashbacks... at stores, gas stations and just places we used to go... often if I revisit it the first few times, I have trouble not getting flashbacks.... and I just now cried reading over old cards.

I love my new boyfriend, of two years but I get pretty sad about my past. My ex fiance and I are still friends. We meet up couple times a year just to catch up with each other. He's moving to another state in Jan 2017.

I'm not sure if I'll ever not feel sad about my past... about letting go of someone who loved me so much. We were each other first... spent 8 years together, grew up together. He taught me how to cook, took me on vacations... we did everything together.

Would I ever stop feeling sorry for our past and move on completely? I want to get married and have a family...