Farewell to arms chapter 6-12 I think it's in ch 6 or 7
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I don't think he is immature more than detached. Frederic was yet to face his demons and understand who he is. Sure sex might have been his original intent but that would have been the case with a lot of soldiers.
He compares their love to a Bridge Game.
This commeny gives us a clear understanding of how immature he is.