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CarpeLanam-ren esaldiei buruzko iruzkinak
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Itzuli CarpeLanam erabiltzailearen esaldiak
Tibi diem natalem felicem!
I like this as well.
I agree, it sounds natural to a native English speaker. It implies the friendship began some time ago and they were close at least then, although the question is open whether they have continued as close friends. If you added another clause it would be even more tantalizing, like the blurb for a novel: "Friendship bound them together, but their love for the same woman threatened to tear them apart."
Thank you for this!