I have a close relationship with a girl (read the description and answer carefully, thank you) but I don’t know if he and I have any affection for each other.

If you have a chance, you should meet and like her. The fact that you can write such a long question shows that you care about her. Because you are inexperienced, you don’t know this kind of relationship. At this stage, just follow Do what you promised, study hard, and get admitted to a university in Shanghai. Even if it's not the same school, it's still in the same city. Then you can develop your relationship.