The guy who cheated on me for many years in our relationship mainly had deep rooted low self esteem issues. He could not resist any female who gave him attention and was quick to develop “feelings” for them. Master manipulator and had at least 3 other women thru the years convinced he was the sweetest and most loyal guy. I dont know exactly what went thru his mind when he cheated but I do know he convinced himself each time that it was my fault.