I feel like it is because you may change your mind and don't known what tm brings. with love it's never a sure thing, you may think you will end up marrying someone then it doesn't happen or you can end up marrying the guy u didn't think you marry. after many break up I kind of learned you shouldn't make a relationship harder but making assumptions or putting pressure on it. just live life day by day with someone you like and see yourself with long term, that makes you happy. I known I answer my own question in a way but I wanna see what other people think.