I think this one could be just as much about a divorce as pregnancy. The narrator could be a husband, being left by his wife, and she takes the children with her, and he can't do anything but stand back and watch them leave him. It's possible that his wife just doesn't get him, or understand him, because he's different ("that's a part of me"). The wife can't go on with the pain and the relationship, because she's bored and their love is dead ("it's all the same, share the pain with me", "waste your time on me").
I think this one could be just as much about a divorce as pregnancy. The narrator could be a husband, being left by his wife, and she takes the children with her, and he can't do anything but stand back and watch them leave him. It's possible that his wife just doesn't get him, or understand him, because he's different ("that's a part of me"). The wife can't go on with the pain and the relationship, because she's bored and their love is dead ("it's all the same, share the pain with me", "waste your time on me").