I Have Trust Issues

This day proved that I can never trust anyone in this life time . I am a very sincere employee I always give my best and outcome of my work is pretty good , recently one of my colleague started taking the credit for all the effort I put , I didn't take it seriously but I informed my superior about her attitude , he said he will stand by me etc etc . Friday is the last day of our agreement, I finished everything . Monday morning I was expecting an appreciations for our team , instead my superior projected all our hard as his hard work to the business team . Coming to fact , no where on paper it says I worked for this assignment, honestly I spent day and night working to make it a success . I am deeply pained by the intensity of the backstab , I trusted only him .

I swear from today I won't trust anyone , not even my shadow