What does the term associate mean when the person is described as a Walmart associate?
In Wal-Mart's usage it's an euphemism for an employee.
Dreaming of your boyfriend's best friend could mean nothing more than that you spend a significant time with this person, and that you associate him with your boyfriend. Dreaming of a person does not indicate any emotional connection or attraction, and it does not mean that person is thinking or dreaming about you.
One need not think about a person while awake in order for that person to appear in a dream. The dreamer's subconscious mind might associate that individual with a particular memory or experience from the preceding day. That individual might symbolize someone or something else in the dream - there are countless possibilities. However, seeing someone in a dream does NOT mean that person was thinking of the dreamer.
This is obviously a personal question to you. Nobody knows what it will mean as we don't know that other person. But did you like that other person? I guess it might mean you want to get married to that other person. A wedding can symbolize any sort of publically declared contract or commitment. It could represent the dreamer forming a connection with the deceased. For example, a decision to write a biography of a…