Rule #1: Friends will use you. If a relationship is not symbiotic, cut it loose.

Rule #2: If he doesn't care about you, don't care about him. Adds on to Rule #1^^

Rule #3: The only true friends in your life are those who care about your health & success in the future. The others are just temporary accomplices that are there to distract you from reaching your full potential in life. Use them and dump them, as they will use you and dump you.

Such is life.