What does it mean if my friends with benefits wants to travel Europe together and said if we’re not married by 30, we should marry each other?

Anonymous
We’ve been friends for over 10 years but started hooking up a few months ago. Lately, he’s been making long term plans when he never did before
What does it mean if my friends with benefits wants to travel Europe together and said if we’re not married by 30, we should marry each other?
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