I'm going to have to respectfully disagree with the above conversation. An A doesn't "just happen" by "accident". In all the years I have been active in relationships, I have not always felt my needs were met. Also while those needs weren't being met I had plenty of opportunity to cake eat. I was a very popular person with a lot going right for me. Had jobs which almost promoted girls to want me. (No I wasn't in a rock band haha) Not once did I cave and let it happen. Even now as I am I a relationship in which the other party show little to no interest in me, moved out and is trying to put me to the curb, I still remain faithful.
I don't mean to be the one to kick the bucket but I personally look at an A as a lack of respect and/or lack of self control.
Me 34, XF 27 Many years together Son 4 Engaged Not engaged Many false starts by XF 7/16 new girlfriend comes into my life 2/17 girlfriend moves in my home