Why would my partner of over 12 years be upset because I do not want to take his last name if we get married?

I am not a kid, okay? I am well over 40. I have been single and never been married before. I want to keep my last name -no, I do not want to hyphenate it with his - that would sound way too awkward sounding. My last name sounds really weird and his is way too long! He has agreed to "jump the broom" and I... show more I am not a kid, okay? I am well over 40. I have been single and never been married before. I want to keep my last name -no, I do not want to hyphenate it with his - that would sound way too awkward sounding. My last name sounds really weird and his is way too long!

He has agreed to "jump the broom" and I know that was hard for him to get his head around the first few years - he was a former Catholic alter boy and was a born again Pentecostal Christian many moons ago in his first marriage. He is pretty much anti-religion now.
Update: The passenger - My last name is my family name - I have never married before - I was asked a few times - never wanted to in my 20's - 40's!
Update 2: Anama! You might be on to something! McKenzie-Muldowney?
OR McDowney?
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