Should i just leave or should i stay?

Ok here goes, I'm 31 married and have 2 beautiful daughters. I am successful in my job and have a lovely home. All sounds good so far doesn't it. Well why do i have this ever growing feeling of just running away? I have done some things i am not proud of in the past, in fact very recently. I went away on business and spent the whole weekend with a total stranger who blew me away. What i mean is i have fallen for her and she may not feel the same but i just can't shake it. I married my wife through a combination of guilt, she fell pregnant, doing the right thing and due to my upbringing thought the best way to handle the situation. I left her for a girl i was madly in love with and broke her heart too. I just seem to leave a trail of destruction everywhere i go. Since i have been married i have slept with a total of 6 women. I feel like it is an escape to be totally honest. Why now am i offering this up to total strangers? I have asked myself this and have come to the conclusion. Perfection is not a reality but merely an illusion of our insecurities that allows us to carry on. We will all leave this earth at some time so is being selfish really so bad? To say my head is swimming would be an understatement. I leave it to you now the faithful few.