Too many people look for disappointment around every corner, and they are always surprised when they find it! You have to approach life openly, prepared for the worst but hoping earnestly for the best.
Look for love and happiness instead. If someone hurts you, don't dwell on it after the fact. Regardless of intentions, it is not important to you or your happiness. What other people think or say of you in the long term is completely outside of your control, so don't beat yourself up over it.
You must have the strength and resolve to accept the pain, and move on.