You can find yourself in an endless loop where you explain that you feel negative because of the negative behaviour of someone else. But if, instead, you take control of your own emotions and you think an improved thought because it feels better to do so, you will discover that no matter how the negative trend got started you can turn it around. You have no real control of what anyone else is doing with their Vibration (or with their actions, for that matter), but you have complete control over your own thoughts, Vibrations, emotions, and point of attraction. Abraham-Hicks
The first thing you need to know is: Nothing that you do is because of anyone else, you decide how you will react to everything that comes at you. No one can make you do anything.
The second thing: Blaming someone else for the way you act will serve to divert the focus to the other person (for awhile) and/or enable you to avoid dealing with your own emotions.
People can and will say or do things that hurt you, but you have the control over how you react. How you handle things is entirely up to you. You have no control over what they say or do, but you have the power to let it roll off your back or carry it around for twenty years letting it ruin your life....it's up to you.
The third thing: There is no blame, it doesn't matter who started it, things are just as they are.... In the here and now, this is what is going on, and all you have to do is allow that to be what it is, and don't let it adversely affect you.
You have all the control, you see, you don't have to permit anyone's negative talk or action to bother you. Work on keeping your own vibration up.