If you know about your husband's extra-marital affair, then first of all keep yourself calm. Nothing will be gained from fighting fights. Before giving any kind of response, think about what is the reason for the distance in your relationship.
Actually, there can be many reasons for this. Do not be hasty in taking any decision, because fights without thinking can end your relationship forever.
If your husband is attracted to another woman, treat them with love instead of quarreling. Try to explain them. For the reasons that have come distance between you both, understand your mistakes and work on them, because sometimes due to the small mind-boggling between you both, distances start coming in both. Due to this, there is a decrease in romance between the two, due to which your husband starts getting attracted towards another woman.

Give time to your partner. Many times the reason for the distance between you both is not to give them time. In such a situation, from where he gets time and care, he starts getting attracted towards that. So give them full time. It may be that between home work, office, social life and children you are not able to pay attention to them, but you have to keep a balance.
Speak less and listen to more of them. Ask about how their day was while sleeping at night and try to find out the reason for their disturbance. Increase your sharing. Boost them that you are with them and everything will be alright.
Do not let your romance end. Surprise plan them differently. Keep doing something new so that they start getting interested in you. Do not let the intemacy between you end. Try to keep them happy in every way.