<human>: Summarize the given text in a few sentences.

So, a friend of mine let me stay in her apartment when I was broke and about to start a new job in another country about three years ago. We agreed that I'd pay her back for my share of the rent by transferring the money to her bank account when I started working. When I started the job, I emailed her a payment plan to let her know when to expect the money and asked her for her account information so I could transfer it. She never responded even though I asked her several times for the information. 

We spoke/emailed/Skyped many times after that and even saw each other in person once, but she never brought up the loan again. Because of that, I thought she had decided to forget about it. Last week, she asked me for the money. The problem is, I am starting graduate school and used up the money I'd saved (including the money I'd put aside to pay her back) for tuition (in addition to taking out student loans). I have no income and won't for at least the next two years. I tried to explain this to my friend, but she became really angry and said I was being unfair and was taking advantage of her.

I know I should have set the money that I owed her aside and not used it for tuition, but after almost three years of not mentioning it after I asked for her account info, I truly thought she decided not to ask me to pay back my part of the rent. Now I just don't have the money, and I won't until I start working again. I am hoping to find a part time job so that I could start slowly paying her back. I told her all this and she is still extremely angry.

Anyway, I feel really awful. I was just hoping someone out there could tell me I'm not a terrible person for not paying my debt, and maybe give me some advice about what to do.
<bot>: A friend loaned me money three years ago, did not give me the necessary info to transfer the money to her, then never mentioned it again. Now she wants to be paid back but I am a broke student. What do?