I think this is pretty much the opposite of her other song, "You Won't Find This". There, she sang about how he'll feel sorry that he left her. Here, she sings about how bad she feels about hurting him. She's singing this when she thinks she made a mistake and wants to get back together with her ex.
She knows that he'll do one of two things. Either he'll take her in and they'll get back together, or he'll just turn her down and say "I Told You So". In this song, she expresses how bad she feels for leaving him and wants him to accept her apology.
I think this is pretty much the opposite of her other song, "You Won't Find This". There, she sang about how he'll feel sorry that he left her. Here, she sings about how bad she feels about hurting him. She's singing this when she thinks she made a mistake and wants to get back together with her ex.
She knows that he'll do one of two things. Either he'll take her in and they'll get back together, or he'll just turn her down and say "I Told You So". In this song, she expresses how bad she feels for leaving him and wants him to accept her apology.