Why Fall In Love

Every time i say how much i love someone it never seems to be anything serious to the other person. Some people say "To love someone you have to be willing to give them your all without holding back" but what would that help. you give someone your all in hopes that they'll give you their all but when they don't your left with nothing but heartache and tears. so why put yourself through that much drama? Are the few weeks of smiles he gives you even worth the years of emotional damage he leaves you with? Scared that the next guy after him will be just like him. Is it really even worth it?