Date site interfering in a loving relationship?

im in a loving relationship with a man for four years now,we get along great and are very attracted to each other our sex life is up and down sometimes great sometimes slow,we just enjoy being together,and are very close,but we have one problem i have caught him on date sites twice now he has admitted it and says... show more im in a loving relationship with a man for four years now,we get along great and are very attracted to each other our sex life is up and down sometimes great sometimes slow,we just enjoy being together,and are very close,but we have one problem i have caught him on date sites twice now he has admitted it and says he has no idea why he does it and he says he wants no one else and would never cheat,but all his profiles have said single,but im not so sure as you dont advertise if your not looking so im very confused as hes so loving and spends all his free time with me we dnt live together but are together most of the time,it upsets me and think this type of activity could lead to temptation.he has a very unstable family life all brothers have major problems he is 43 so should know wright from wrong,im confused and think its time to leave if he does it again but it also is not consistant with how he treats me which is wonderful,but on the other hand its disrespectful to me as he knows its wrong but is still tempted to do it,he did say once maybe im just checking too see if im still attractive to women i dont believe that as he has also flirted with them not just waited too see how many hits he gets so ok any advise???? he says im in love with you
Update: at the moment the date sites have been deleted but am scared it will happen again as if it happens when yr happy what happens if you hit a rocky patch
Update 2: i expected all these answer below,nothing i havent thought myself he says if he does it again he will end the relationship,but any actual advise???
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