Stupidity? or just desperate??

Co
I really don't understand the reason why women get cheated on. Like do you just not feel those vibes from your man?? Personally I've never been cheated on. I've been with my man since I was 15, he was 16. We're very connected, we have all the same views, we both are very sexual with eachother, we balance eachother, we are always on the same page when it comes to parenting our 3 year old son. In one word, were infatuated with eachother. In every way possible. Life feels soooo good with him. And I can feel how happy he is as well. Our lives only get better and better every month passing.. Our days are spent teaching our son love and self respect. Id like to think we're open minded hippies😂 ALL of our friends in high school always said we needed to chill and live before we settle down with eachother. We never saw us as too young or not experienced enough for life's struggles. We just always got through everything because we had eachother.. We are still friends with most of those same friends today.. (I will be 23 in July and he will be 24 in April) a lot of those friends got married and started trying to have a family right after jaime and I become pregnant in 2012. I never understood why they thought it was a race? That's how all these women acted. These couples are a few years older than my man so they're about 26 or so. And now jaime and I are closer than ever and all our friends are getting divorced with 2 kids or more.. It breaks my heart seeing my friends who were so perfect years ago, totally lose respect for one another.. They cheat on eachother, they lie constantly.. I guess what I want to know is what makes people THINK they're in love when down the road it's very clear that was never the case? How do people really fake it?? I'm in shock as to why people would want to lie about a SO or their lives together just to make another jealous or feel not enough in their own relationship. I'm not referring to myself, I'm BEYOND happy and in love with everything about my life and my relationships. But damn this is so heart breaking to hear my kids friends parents will never be together again... What makes the heart think they love someone?