I have only one female friend, her name is S, she also suffered from mental disorders in the past, but now she is fine as I am. A few days ago it was my birthday, and she was the only person who came for the meal I organized. I am very happy that we met, even if at the end of the evening I felt a very strong anxiety, my question is this: how deep can this friendship become? I wish she was like one of those movie friends, but I don't know how to contact her to see us again. My birthday was 17th, we haven't heard from each other since, when should I write to her? And for what? have a coffee together? Going out to eat? I'm very afraid to bother her, but I care a lot about her!