<prompt> Human: Back story is that I use to have a friend whom I was really close with, but because the relationship was just toxic for both parties, we ended it on not so friendly terms. Before that, however, she borrowed money from one of our mutual friends to pay for her schooling because her parents make too much for grants, but too little to pay for college. When that mutual friend needed money to travel, I ended up making a deal with her. Basically, I pay off the money she borrowed, and in turn she would pay me instead. It was well over 600 dollars that I paid off. Because I was convinced that she would pay me back in due time when she had the means too, I went ahead and did that.My first mistake was not getting that down in writing. I have no way of proving whether she borrowed money from me and if she has the decency to woman up to loan and just pay it back.We broke off the friendship somewhere back in August of last year, and now its December. I have not heard a single word from her. I dont feel comfortable contacting her myself because I get anxious, shakes, breathless, and that feeling like I want to throw up and just fall into a void and disappear mild anxiety attacks?. I know from a friend that she would be going to Disneyland or Santa Monica Pier to have fun with her friends, but she acts like she doesnt owe anyone money.I have written this off as a loss on my part, but it bothers me how some people are this inconsiderate with agreements. I have learned to either get loans like that in writing so I can be protected, but it still bothers me.What Im asking, essentially, is there a way I can get that whats owed back? Or should I just chalk it up as a loss and learn from my mistakes?EDIT: Thanks for the responses. It really help put some stuff into perspective. Because the nature of how that friendship ended, contacting them would be more trouble than its worth, so I guess this will be just one expensive life lesson. Thanks everyone. I appreciated all of your input. Thank you!  <response>: 600 life lesson 