Complex sentence: Whilst my love never faltered she had always a love/hate relationship to me (sometimes hard to bear) but absence makes the heart grow fonder and she now conludes yes indeed she loves me as I love her.
Split into simpler sentences: Whilst my love never faltered, she, by contrast, always had a love/hate relationship towards me (sometimes hard to bear). But absence makes the heart grow fonder, and she now concludes that, yes indeed, she loves me as I love her.