nothing the dialogs hints at that (in fact it's the Scoundrel who is apparently interested in Leah) but it would be logical seeing how Act I basically starts with you helping a very damsel-in-distress-like weak Leah (she's been sitting in New Tristram tending to the zombie victims while Cain was missing, she shows you Adria's hut but doesn't join you in the Cathedral; you are basically the hero who rescues her surrogate (grand)father while she sits at home twiddling thumbs).