you're associated mainly with that person and their basically the only person you do physical things with but you have some slip ups because considering that you're not officially together with a label you're allowed to let your eyes hands and lips wander a bit. You both have to understand that your not a priority until you have decided you guys want to be more than just a thing . A thing is like a step towards thinking about being more because you care about the person but can end in relationship or hatred. All depending on the people and if they discussed and agreed on what they both expect. You have to be on the same page or things get messy. And you have to have the same idea of an outcome. Even though the outcomes are never certain things can fade off where as relationships end much more abruptly. Things can be something one day and nothing the next it all depends on the actions &feelings of both parties they're best when feelings are kept minimal until discussed more thoroughly with both parties