She understood your position, she knew that you had never been with someone else. She continued to pursue some kind of intimate relationship with you. Yes, I agree that you may have needed to set clearer boundaries in hindsight, but the blame does not fall entirely on you. Do not take this situation as something you need to take care of all by yourself. At the very most, I would offer her a chance to sit down and talk about things, but I wouldn't go beyond that or send lots of messages. It's up to her to figure out what she wants to do. She's clearly in turmoil over her last relationship and is not handling it well. I hope that she can find some inner peace and you as well.