Alastor unfaithful?...

Alastor was your husband, you both loved each other, you adored him, he was always cute, smiling and tender, until he started acting strange, you didn't know what was happening to him, but now he was cold and dry, you decided to follow him since he always came out from the house at the same time, you started to worry since he was arriving at a woman's house, you saw that he knocked on the door and then that girl opened it for him, you were paralyzed when you saw how he greeted her with so much love and affection, no. I knew what to do, you only saw them from afar...

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