Lot of things happen in life. Lot of people come and go. It cannot happen that every time life be fair to you. Some kind of unfair can come your way at some or the other point of time. Be patient and introspect to see if you can do something such that you might escape the unfair act of life next time. Banging back at things and people will only leave you even more frustrated, which is the most useless emotion to get in life.