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The cause of our emotional involvement with worldly things is that we are taking them too seriously which actually we should not. We should realise that no difficulties or problems are permanent.They all will pass. Such is the law. Everything is in a state of constant motion and change. Nothing is permanent and static here.
Taking things seriously also results in formation of deep impressions in your subconscious mind which results in development of various biases and prejudices in our mind in favour of and against various things and reduces its ability to see things objectively. IN other words, emotions of like,dislike,love ,hated,jealously,revenge,etc. should be gradually rooted out resulting in a truly unbiased and detached mind which can remain calm, serene and balanced in all the trials and odds of life.