Is it normal to feel guilty after leaving a toxic relationship?
Yes. Guilt is common, especially if you were used to managing the other person's feelings. It doesn't mean you made the wrong decision.
Why do I feel bad for leaving someone who treated me badly?
Because guilt also responds to breaking old roles and to the other person's pain, not only to doing something wrong.
How do I stop feeling guilty for leaving?
Separate your actions from their feelings, look at what staying would have cost you, and give it time. Guilt often softens as your new life gets steadier.
Why do I feel calm after leaving?
Often because your body is no longer on alert. Calm doesn't mean it wasn't bad.