Its a hard one to answer. How do you both feel about the situation? Do you feel that you are 'owned', does he feel that he 'owns' you? To be frank, unless you have made an explicit statement to that effect, then you cannot know your current status. Best way to deal with this issue is to ask him.

The concept of a collar no longer really has any consistant definition (see the many other posts on this forum about that issue...) so al lot depends on what he considers a collar to mean and, in this case, what he considers a specific type of collar to mean.