There’s no obligation to keep loving someone with whom you’ve broken up. It’s admirable to respect them if they’ve earned it. Perhaps you need to enact a ritual of some kind: e.g., get a nice container, put the keepsakes worth saving in it, lock it, and put it away. Or if you’re a more impulsive type, have a little bonfire… though you may later regret disposing of things in such a permanent way. Whatever you do, it sounds like it’s time to close a door, as painful as that may be.