"Everything" is a massive stretch. INFJ's are extraordinarily loyal, but that loyalty also applies to themselves. If someone isn't good for an INFJ, that person won't remain in the INFJ's life for long. There is an underlying, pervasive sense of loneliness, but being that it is such an innate part of our personalities, we generally aren't tortured by it. We do desire a deep connection, to be understood, but we'd never sacrifice parts of ourselves to gain that.