The one you love makes a hole in your heart and fills it with a very specially shaped object. When you lose your love, you feel the emptiness, and you try to fill the hole with various other objects. But none of them fit, because that hole was specially drilled by your lover to fit HIS object (and no, not that one).
Worse, the more you try to fit the other wrong-shaped objects into the hole, the more the hole bleeds and opens up, rather than closing eventually like a normal wound. So sometimes, you go back and get your ex-lover and try to put him in there again, where he was before. Everything all right now? NO. His shape has changed, and the hole has changed too, so even HE doesn’t fit any more.
So what you’ve gotta do is wait till that hole starts closing up on its own, like a wound growing a scab over it. When that scab falls off, and you can feel the new skin underneath, THEN find someone who can drill a new hole, unique to them, and fill it perfectly.
And this is what you get.