This answer will vary for every relationship and each person. I've seen couples throughout tech who are both devs so it is possible. But it is ok if people don't marry devs. Developers marrying another a developer are just like every relationship. Both people need to put in the work and effort to make it work.
I've never been married, but I began learning how to code when I was in a relationship. I learned from that relationship that I don't care if my future partner is a developer or not. What I do care about is if he's supportive of my career and understanding of what life for a dev is like.
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