What can I do to get him to propose?

We've been together almost two years (December 24th will be 2 years). He says his plan is to be with me forever. We are getting ready to move in together.

He randomly brings up marriage when we're together. He tells me he has everything he wants and needs because he has me.

He says he loves me all the time. I love him very much, and I want to spend the rest of my life with him. Things are pretty much perfect in my opinion.

The only thing I want to change is I want to marry him. I'd ask him myself but he's kind of traditional and I don't know how he'd react. So how can I get him to ask me?
What can I do to get him to propose?
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