For me, relationship is like a mirror. Whatever action, reaction or non-action that one is taking in a relationship should always be reflected upon from time to time.
Put yourself in the other person’s shoes and ask your heart how you would feel if the same is being done to you. If you wouldn’t want to be treated in a certain way, do not treat the other person in that way.
I think this is only fair, no? You cannot possibly expect people to respect you if you do not know how to give respect. Or expect the other person to be thoughtful when you are not.
And when you do or say things that are hurting someone else, remember that one day you may perhaps feel the same pain as well, if not worst.
What goes around comes around. So love wholeheartedly so that you may also be loved wholeheartedly.