Well not knowing you, your man or the whole context of your relationship please take what I say with a grain of salt.

1). Have you two ever discussed marriage in any context?

2). Does it seem to be something that he has any interest in?

3). Does he react favorably when you bring up the subject?

4). Does he have any married couples in his life that are doing well?

5). Are/were his parents married to each other?

If you can answer yes to all of these I'd say you just need to be consistent and wait for him to pop the question.

If you can answer no to three or more, I'd be a little concerned about his interest. But that is no need to rock the boat if you two are doing well.

I hope that answered your question. If you have any follow up questions please let me know.