My friends love eachother. Had sex. But they won't marry. What kinda relationship is that?

If a girl shares her body with me cos of the love between us, i would take all my efforts to marry her.

I feel like what he does is not manly. They really love eachother. But his parents might not support this because she's not catholic.
My friends love eachother. Had sex. But they won't marry. What kinda relationship is that?
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