I have done a huge mistake which I regret so much. I cheated on my husband. I regret it so much. I feel really ashamed to say this but I didn’t know who else to ask on how I can seek forgiveness or if I would ever be forgiven by Allah. How can I seek forgiveness for such a bad thing I have done?

You need to feel the sorrow for the huge guilt, and make a true and sincere intention that you never do it again, and ask for forgiveness from Allah SWT.