The center of the Universe
You are not the center of the Universe; the Sun is. But, if you must insist that you are, then, be more like our Sun. The Sun occasionally allows Earth or Moon to pass its orbit, which resulting in moments we call eclipse. In short, not everything around you is always about you. Be wise and be sensitive to other people's need and feeling.
Negative thinking people often fail to embrace the positive things that happen to them. Instead of showing real appreciation, they stay persistent in their negativity till their worst thoughts are proven correct.
Be like water
Love a person who loves you back like you are his/her drinking water. Always pure and forever in need of you.
Don't waste your love on someone who loves you like you are his/her dessert. Only for five minutes pleasure and usually sinful to the waist.