Why are most of the marriages not last for a long?

I think people are being more jealous nowadays. maybe it is because of social media lifestyle. On the superficial level, they are showing they love each other too much. But, in reality, they are only convincing their spouse or society that they are happy and satisfied with their relationship. They give more attention to others spouse rather than their own. And they have the idea that if this person goes away I can get another easily. By just doing next swipe. xD

But, don't worry. you can still get real love or give it to your spouse. It's all up to you. There are millions of couple they are living perfect loving life.