Does the principle of "what goes around comes around" apply to someone who repented from previous non-adulterous relationships and got married, or does their repentance erase what they feared might be exacted from their family?

Congratulations to you on Allah's acceptance of your repentance. Know that if your repentance is sincere and meets the conditions for acceptance, then we ask Allah that you not be held accountable for your sin, neither in this world nor in the hereafter. For Allah accepts repentance from His servants and pardons evil deeds.