My crush is about to start a relationship with her ex. What to do?

My crush, which is also a work colleague with whom I am very very good and close friends is about to start a relationship with her ex. I am male, she is female. While we were talking over time, she told me that she liked me very much in the sense of a lover about a year ago. I was dealing with another girl at that time and I didn't pay the necessary attention to this girl I like at the moment. As time passed, I started to like her too, and at the moment I can say that I really fell in love with her. And I also told her a few months ago that I like her a lot and that I would like to move on to being together. She then communicated to me that due to the fact that at that moment she liked me, I did not pay her any attention, she suffered and tried very hard to get over me and in the end she resumed contact with her ex. And due to the fact that he reconnected with his ex, we can't move forward on this (I know for sure that they weren't together at that moment, they were just talking). This happened about 4-5 months ago. Then I said ok, but we continued our friendship as if nothing had happened. I could even say that we got even closer because we started staying over and going out together after work from time to time. I also mention the fact that we have been talking daily on messages for a very long time. Now something happened at work and we are on leave for 3 months. Of course, during this time we didn't see each other every day and my opinion is that her relationship with her ex has evolved compared to 2-3 months ago. During this time I also felt that she grew cold towards me. And now I told her that I would like to see her from time to time during these 2 months of leave that are left, and she told me that it doesn't feel good to go out just the two of us and that neither it is not normal to have such a close relationship because we make people around us think that we are together. What do you think I should do to have at least a chance in the future?

My crush is about to start a relationship with her ex. What to do?
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