get a voodoo doll... and by that, i mean a cute stuffed toy animal that somehow resembles them, and hold it to the empty spot in your chest, and channel your love to them that way.
your story is very sad. my good voodoo doll idea will only take you so far, but hopefully far enough to give you strength to do something tangible and real about your situation.
Hangout with me. I have free time. I am on a week's vacation.
You won't necessarily stop missing them, with the passage of time, unless you find somebody (or something) else to fill the void. And whether a problem exists, I don't know because we don't know how long you have been missing them.
Is it an Ex?
Visit them. Try to contact them as much as you can.