Most of people are too broken and insecure to start and trust any new relationship, cause simply something is missing since they are no longer with their beloved ones. But are we gonna let this affect on us for the rest of our lives? I think that only your thoughts made you miserable as shit! But if you get the fuck out and started knowing new people, you can do as fine as it gets. just always remember that you're here in life to enjoy it ! No one can breaks your heart! stop being so dramatic.. we all had that one who made our life sounds like HELL and we will NEVER get over our memories we had with then and the feelings we used to share and it's totally normal but it doesn't mean that you step back and be miserable. Live Laugh and Love.
Just ACCEPT IT.