Alastor unfaithful?...

Alastor was your husband; you both loved each other, you adored him, and he was always sweet, smiling, and tender, until he started acting strange. You didn't know what was happening to him, but now he was cold and distant. You decided to follow him since he always left the house at the same time. You began to worry as you saw him arriving at a woman's house; you watched as he knocked on the door and then that girl opened it for him. You froze seeing how he greeted her with so much love and affection. You didn't know what to do, you just watched them from afar…

Alastor is unfaithful to you and you just discovered it, what will you do in that situation?