Let me summarize this as much as possible:

Liked a coworker, thought she liked me back, she said that she was not ready for it. Later she told me that she was raped. I felt awful about what happened to her and wanted to show her that I only had good intentions toward her. I tried to get closer to her, but I felt pushback and I started getting annoyed at the extremely slow replies. So, I mentioned that if she thought that I was too intense it would be better to not talk anymore. She got upset that I did want to be her friend anymore. I felt bad that she got upset with me. She said that needed to complete her college assignment because according to her words "she was fucking her ex all summer and didn't dedicate time to her class". That was probably the 4th red flag for me by this point. 1st was her getting upset over anything, 2nd was her being extremely slow to respond, 3rd was her belittling me for anything that she didn't consider of her caliber, 5th was she mentioned that everything that I did was a red flag. Well, I wanted her to really like me since I really wanted a gf, so I shut down all my gut feelings and offered to do all the college work for her. So, I was working my full-time job, took all my vacation time to help her, and all my free time, and I would be her cheerleader trying to encourage her because she would always be super sad always thinking that she was going to fail and all of that. Nobody wanted to help her, not her sister nor her ex (even though she was still super duper obsessed with him). So, I wrote a total of 16 journals in 3 months, all of this on top of all her verbal abuse because she had to correct grammar and sentence structure since English is not my native language. However, I did all the research and wrote everything. Later, I would get upset that she only texted me to ask me about the status of the paper and never texted me to hang out or to talk about anything else. To that, she replied that "You are intense and your intensity scares me". I was so sick and tired of her. She would have so much time to text and snap with her ex who left her because he didn't want to deal with a girl that was raped but had no time for the guy who was dropping everything else to assure that she graduated and didn't lose her job. Ohh yeah, I forgot to mention that if she didn't complete this class she would lose her job since the diploma needed to be submitted at the end of the semester to not lose employment at the company we work for. So, I was being the idiot who was doing free labor, and whenever I just wanted to quit, she would just guilt trip me with "I thought that you cared about me", and then would say with the sweetest voice "I haven't given away the idea of us being together". So me being the total idiot that I was I finally finished the class for her and got her an A. Then one week after the class ended she told all our cohort at work that I was a creep obsessed with her, and then she told me that if I ever contact her again she would tell HR about me... I was so brain fucked about what just happened. I just told her how she used me, and she said "I would never use anyone. I am a good person. You did all of that out of your own free will". And then she blocked me from FB and said that if I ever contact her through work, she would have me fired. She said that “You did help me, but that still hunts me", and then she blocked me from FB. Later I realized that she destroyed my reputation at work to make sure that everyone would take her side if I ever complained about what she did to me.

I will always be super angry at her, but definitely more angry at myself for being so desperate for a gf, that I just let someone manipulate me like a fiddle and just threw away logic and my gut instinct just because I really wanted a gf.

TLDR: Forget about desperation being a turn-off. Do not be like me, do not be so desperate for a gf that you get PTSD and anger about someone leading you on for 3 months and then just throwing you into the guillotine, and then saying that it was all on you making everyone believe that you are the bad guy in the story. When everything that you did was help someone and all that you asked in exchange was more of her time to get to know her and form a deeper connection with her.

Edit: I forgot to mentioned that before she blocked me, she showed me her newly created OkCupid profile and told me how she would prefer to date any random stranger than me... Protect yourself from people like this by not being desperate...