Marriage complicates things?

I'm 36 boyfriend is 53... We love each other deeply and express that often. He has never been married and has the belief that marriage just complicates things. He also doesn't even bat an eye or flinch whwn others already assume we are married or refer to me as his wife. How can I change his view on that without scaring him and get him to make the leap to propose as I would gladly agree to spend my life with him even if meant no ring (have not told him that)?

Marriage complicates things?
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