I haven't had the opportunity to discuss with you, (about) how much my passion in art has grown ever since I started studying in your classes.
I've changed your original sentence quite radically, this version may or may not be what you are looking for. No doubt, someone will dissect it to pieces but it is a starting point!
To discuss means to have a conversation with another person. As I speak Italian I am aware that this verb can and does create problems for speakers of other Romance languages as the verb, discuss, usually has negative connotations in their language. Discussione in Italian is quite similar to the English definition of argument and quarrel. However, in English, discussion is often used when two or more people are especially interested in a topic or a subject. Sometimes discussions are calm, well mannered and polite. Sometimes they can become over excited, passionate and heated, which eventually will lead onto an argument (a very common occurrence in Italy!).
In the case of Sean Pierre, I chose the verb discuss purposely, because he expressed a desire to talk to his mentor, in person, and to thank him for communicating and transmitting his passion in the fine arts. Indubitably, the two would have continued their conversation, and most likely to have remained on the topic of art.
Therefore, discuss, for all the reasons I stated above, performs this task (talk in person) more effectively than to talk.