Having feelings about someone other than your spouse will eventually destroy you. It started like you a flirtatious attitude toward someone. This was the first of many. Satan too knew my weakness he fed on it. I blamed situations and allowed them to be the reason for my affairs.
Truth is it felt good, the chase, the catch, the physical promiscuity.
The reasons we choose to do things outside of God's commands are not important we all can find excuses for our actions. I lived in chaos for the first 30 years of my life. Living for the flesh only fulfilling the flesh. It did not matter whom I walked on, whom I hurt. Who ever got in my path I walked on.