In modern times couples are more concerned about loyalty than love.
Being faithful and monogamous is not natural for human beings. It takes work. Deep down we all know that. We have all been tempted to stray at some point or another. Even when it was only a fleeting thought and we didn't act on it. Every time we acknowledge that someone of the opposite sex is "attractive" or "sexy" we are doing nothing other than pointing out that they would be a suitable mate. Not acting on that natural impulse to want to mate with a viable mating partner requires a conscious decision. It's a constant struggle between what your body wants, and what the civilized part of your brain says you should do, in order to avoid the negative consequences of cheating on your spouse and ruining your long-term relationship. That's why affairs, and extra-marital sex, are often referred to as "a moment of weakness.
There is nothing inherently painful about being cheated on.
No matter how much I tried to justify the affair, the fact remained that I was a deceitful person. One moment I was making out with a man and an hour later I was in bed with another man. Who had I become? What had I lost in life that led me to do this? Did I not have a perfect life? Was I not happy? Of course, I was happy. I knew I was happy and content. Had I become greedy? I was in a maze and I could not find a way out.
The desire to love someone always exceeds the desire to be loved by someone & that's exactly why we end up loving the person who doesn't deserve that LOVE. That is why never get into any kind of relationship with a married person because soon you will realize that you were just another episode in their life.