The Girls star, who recalls the crime in her recently published memoir, Not That Kind of Girl: A Young Woman Tells You What She's Learned , explained that she was hoping to help others by writing about her experience.
Incredibly some people accused Lena of lying about the story – which forced the 28-year-old to speak out again.
Writing on Buzzfeed her essay read: “Speaking out was never about exposing the man who assaulted me.
“Rather, it was about exposing my shame, letting it dry out in the sun. I did not wish to be contacted by him or to open a criminal investigation.
“I am in a loving and peaceful place in my life and I am not willing to sacrifice any more of it for this person I do not know, aside from one night I will never forget. That is my choice.”
Lena also confronted the people who questioned why she never reported the crime, saying: “I was afraid that no one would believe me.
“I was afraid other potential partners would consider me damaged goods. I was afraid I was overreacting. I was afraid it was my fault. I was afraid he would be angry.
“I hoped [through talking about it] I might inspire others to share, and that forming these connections would assist us all in healing.
“I was not naïve enough to believe the essay in my book would be met with pure empathy or wild applause...but I hoped beyond hope that the sensitive nature of the event would be honoured, and that no one would attempt to reopen these wounds or deepen my trauma.”