Whether you've been with someone for a long time or only just recently began dating them, you may find yourself doing just about everything you can to keep the relationship strong. Sadly, not everyone is similarly disposed. Staying in a relationship makes no sense when you are the only one investing in it -- physically, mentally, and emotionally. Relationships cannot maintain themselves. Just like an air conditioner or refrigerator can't operate without routine maintenance, a relationship is not self-sustaining. Moreover, it isn't fair for only one person to shoulder all the work. Each partner deserves to feel loved and appreciated. Each person should feel as though the other has their best interests at heart. Sticking around and hoping they'll change is not a risk worth taking when they've shown time and time again that what you see is what you'll get. They don't have to say a word; their actions prove that either they're in the relationsh...