Possibly about an ex-relationship to someone. Someone hurted her much, broke her heart, made her promises he couldn't keep, insulted her. She feels down but what he had done to her won't get her down forever, she tells him, that she's now stronger than he could ever think.
Also I think this comparision with the lake means that what he had done to her may come back to him one day, kind of revenge for his sins. It will be buried, but not forgotten. He will be the loser, not her, because she gained strength through all oft it. She's got an ocean, he's got just a lake.
Possibly about an ex-relationship to someone. Someone hurted her much, broke her heart, made her promises he couldn't keep, insulted her. She feels down but what he had done to her won't get her down forever, she tells him, that she's now stronger than he could ever think. Also I think this comparision with the lake means that what he had done to her may come back to him one day, kind of revenge for his sins. It will be buried, but not forgotten. He will be the loser, not her, because she gained strength through all oft it. She's got an ocean, he's got just a lake.