Blaming is so much easier than taking responsibility, because if you take responsibility then you might be to blame.
Unhappiness can be like a virus spreading from one person, to the next person, to the next one and so on. When someone is mean or rude to you, do not let their unhappiness infect your own life. If you are the unhappy one, please quarantine yourself so you do not infect others!
You cannot borrow half of who you are from someone else, yet people try to do it all of the time, they just call it a relationship!