Even thought we can´t afford the sky is over

Really, I just don´t know what should I do. By now, I´ve always chosen to be alone rather than deal with being in a relationship as it is so complicated and hard, and now I don´t know how to be fair to the other person. I´m not able to be fair, because my lovers haven´t ever been fair to me. So question, why should I be fair if no one is fair to me?