How really i can trust ...????

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I wud like to share one incident in my life..I started online business with one Guy , actually he helped me to get into the work , I worked for him for 4 Months , He paid me money for 2 months and i trust him started working more for him ...But lastly he ruined my all money .No reponse for email and call .But after few months passed he responeded me for an email and was saying he didnt got any money but he wud like to return my money now..he told me in a week he will return but now started saying stories ,he asked me another week time .But still i didnt got my money back .....Pls suggest me what i can do in this situation ..pls advice me ..