I think it's true. Not in a "let me forget about myself and only focus on you" kinda way. But in a every choice I make, every action I take, there's going to be a consequence, whether good or bad, for the other involved. I can't just leave my job at the drop of a hat because I hate it. I have another person who needs my help. It has to be a discussion before it happens. I can't just go to the club with the girls and drink and party until 4 am without saying anything to my partner. I can't decide to go to bora bora with my girlfriends for a random weekend getaway without talking to my partner first. These are all just examples (lord knows I'd love to have enough time, money, and friends to take a random trip to bora bora :D) either way. When you're in a relationship it's definitely not all about you anymore. Everything you do or don't do has a consequence, whether good or bad, for the person you're with. It's something you have to take into consideration when making decisions. Especially big ones. How will this affect the relationship? How will this affect my partner? It's not just you anymore.