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Soul,divine are good to hear but in actual what is happening,people get attracted each other and they call themselves they fell in love with each other deeply,madly,soulful,divine,blah blah but later things changes,cheating,affair,divorce....
Just because it had happened to some doesn't mean it's gonna happen to everyone.
Regardless of what happened after, I'm pretty sure the majority of it is genuine. It's true that they're in love--there's an attraction, a spark between them. But you see, relationships should come a long way--it needs effort and time. In some cases, it's hard to even begin a relationship, and in other cases, it's hard to maintain a healthy relationship.
Based on your statement, healthy romantic relationships from the beginning often turn into toxic, unhealthy relationships. That's probably because they don't provide as much time and effort for each other as they have from the beginning. That's also the reason why some relationships burn out because they thought that there's nothing more for them to do with/for each other. They tend to stop there and don't even try to fix things up. That's also the reason why they find other things to satisfy themselves, then comes cheating, affair, divorce as you mentioned. Though there are other reasons why, it is very complicated to include as there are so many ways why relationships turn out like that, sometimes it's not about cheating, affair, a divorce of the sorts.