assalam-mu-alaikum brothers in islam

i have been married for 6 months now after marriage i found out that my husband was having an affair with another girl...this went on for couple of months..we were happy after we got married but slowly he became distant from me and never use to take me out or talk properly...he now says that he has ended the affair and there is no communication between them i feel that he has changed a little towards me and pays more attention...please kindly provide some significant duas which i can read so that my husband will not ever carry on with these unlawful sins..i sincerely pray for leading a happy marriage with him and make dua..we do talk about issues and he does really understand but i dont want him to ever go back to having any other relations with someone else...please can u give me some duas which i can read and pray for me that we have a happy married life...may allah reward u in abundance and bless u for your hard work...wassalam