When Rossen sings, "I can't help myself," I think he is talking about how he can't stop himself from leaving a relationship, even though he is still attached ("And I live to see your face/hate to see you go"). His emotions are pulling him away and toward new things and he doesn't feel like he is in control ("I know no other way...").
When Rossen sings, "I can't help myself," I think he is talking about how he can't stop himself from leaving a relationship, even though he is still attached ("And I live to see your face/hate to see you go"). His emotions are pulling him away and toward new things and he doesn't feel like he is in control ("I know no other way...").