There are different degrees of "smart" and "mature".

Back in my early 30s I had a girlfriend that was similar to Rory. Extremely intelligent. She never received a mark below an A in her entire life. Scored perfect in every class in university (even got a Golden Key Award). She took French in high school and became so fluent in it that she went to France to teach right after graduating. When she returned from Europe she immediately got a job teaching high school in Canada. She was nothing short of the Golden Child while she was in her "bubble". She was also completely oblivious to how her appearance (very good looking and not aware of it) also affected the way people treated her.

I was her first real relationship and it quickly became evident how emotionally immature she really was. The normal shit that people deal with in relationships where so overwhelming that she would just shut down and detach. I remember getting into an argument with her about something trivial (that escalated into a more serious issue because of her immaturity) and I can vividly remember the point where she actually "failed" at something for the first time in her life. It was utterly devastating. Here she is teaching teenagers that she suddenly realized were way more mature than her in a lot of ways. I can best describe it as an existential meltdown (thank God it happened during the summer and she had time to recover over the break).

She was light years ahead of me and everyone else around her in a lot of ways but the simple fact that when it came to emotions... our relationship just proved to be too much for her to handle. I broke up with her before too much damage was done. A few years after me she met a guy that was much less emotionally challenging than me and she is happy and fine. She managed to create a new bubble and I'm so happy for her.