Question about manifesting ex (I know... very unique question haha)

Last year I managed to attract a great woman into my life. It was my first relationship (I'm over 30... so big success). I'm pretty sensitive person and when there are new situations in my life, I get anxiety and I guess first relationship is one of those situations. She was really into me, cute, lively, we had so many things in common, it was absurd. We have known each other for about 3 months total. It was really intense for both of us, I can't get back to any of the moments we had together, because it was so great, that it's painful now.

When I was with her, I was sometimes anxious and at that time I didn't know where that anxiety was coming from, I was afraid it was some form of imcompatibility. I was afraid I'd be wasting her time, that we would break up in the future. I tried explaining this anxiety to her, didn't have it processed at that time and while in panic, I said really stupid things which were not true (that maybe she is not enough for me). And broke up with her. Which hit her hard, she is a little bit older than I am and she has had bad experience of partners leaving her before.

She eventually became angry at me in messages, I replied to her that I'm sorry that I hurt her and that I didn't mean to. Her answer was still angry, so I decided to not reply... for 3 weeks. Because I thought we need some time to heal and that she was in high emotions and I didn't want to argue with her. Unfortunately I should have communicated this more, because according to her, me ignoring her was basically the breaking point of her wanting to have anything with me in the future. :-(

Long story short, we eventually met in person some time later and talked, I already knew what was the anxiety in me (it wasn't about her, it was just me). At the end we hugged, so she isn't indifferent towards me. However I didn't have the courage to tell her then, that I'd like to go back. I found it in me week later, brought her flowers, and she said she will think about it but was afraid it was too late.

I was preparing we will talk about it in person once more, but a month after the flowers, she just wrote me a message she thinks I'm not ready for this kind of relationship, that she wants someone who accepts her the way she is and that she doesn't want any contact and that it is uncomfortable for her to see me. And she wishes me good luck with someone else. That broke me completely. I've never been that mentally down. It has now been a week since this. I can't stop thinking about her, it feels like a nightmare I cannot wake up from.

Since how short it was, and how much time has elapsed since the breakup (3 months and some), do you think it is possible to manifest reconnection? I'm not planning to reach out to her, because it would be uncomfortable for her. However we will have to see each other, because we are in the same social group (in other words - we go to the same events). I spent weeks working on myself, realizing what I truly need in a relationship and she had all of this. I loved her. I only decided to go for the flowers once I knew I would be able to give her the safety of the long term relationship. And now I'm in pain that she doesn't want to see me and hear me out.

Also, I had extraordinary things happen to me before, so I'm kinda open to this idea of manifesting, however I'm still rational and sometimes just need the certainty, which I unfortunately can't get in this. I just need to believe and let go, but this is so difficult...