Based on observations, I believe that we create our own miseries thereby letting the outside factors control our feelings. Why do I say so?
Let's take for example, failed relationship.. When we are in this stage, we undergo too much depression, so many weird thoughts crossed our mind. We think so low of ourselves, low self-esteem, and etc. Haven't you noticed that these are all self-inflicted? We allow ourselves to be the victim of what other people say and what our minds dictate?
When in fact, we are given a free will to chose what we want out of life. You could opt not to accept negative thoughts nor feedback from others. We all have a choice.
I think it's safe to say, that we all create our own misery and not someone else doing. Agree?