What does my friend mean when he says that my temperament has changed?

Friends say that your temperament has changed, which means that you have become better, better and more appreciated than before.

When I first entered the university, because I was a child in the countryside, I dressed very simply. Considering the usual living expenses, I am afraid of causing financial burden to my family, so I am reluctant to dress up. Therefore, I have always been ordinary and only focused on my studies.

Later, after graduation, I found a job and had my own income. Naturally, I would like to pay attention to dressing up and gradually pay attention to my image. Coupled with a wide range of knowledge, people have become more confident and calm. Friends I haven't seen for years say that I can't recognize them soon, and my temperament has changed a lot.

I think people's growth will change a person's temperament, whether in terms of cognition or dressing, we will gradually get better with time and environment.