You can call it a “psychological study” all you want, what you linked boils down to what one person’s opinion is on the subject not an actual science. Given that, if someone’s opinion is that people just do things that would devastate the people they say they love for no reason, then the person with that opinion is…

If you don’t believe in karma, then this is wonderful advice. Speaking from personal experience (and only that), I would advise to break up if you cheat right away. For whatever reason, that comes back to you somefuckinhow no matter how well you covered your tracks. I am truly convinced of this. It just isn’t worth it…