Your life, your health, your relationships and your happiness, are all your responsibility, not God's, your best friend's, your parent's, or anyone else's. YOURS. You are not responsible for anyone else, but yourself. You are not responsible for the way other people choose to feel or for how they live or for what they say and what they do. Your life is yours, and yours only. Live it how you want to.
Happiness is a state of being that you choose. No-one can force you to feel that way. Sometimes people influence you to feel upset, by what they say or do to you, and then you have every right to feel hurt. However, you must not allow yourself to be in that pain, for a long period of time. Learn from the experience and let it go. No matter how cruel the person that hurt you might be, because whether it was intentionally or unintentionally, the event happened to you so that you could learn, and grow from it. Nothing can change what happened, and nothing will change the other person until they experience the same pain they caused. Remember; What goes around comes around, as they will learn one day..