When Naomi and Rus return to Beis Lechem they are living in abject poverty. Rus goes and collects in Boaz's field. When Boaz finds out, instead of inviting these women to live in his home, or providing them with enough funds to sustain themselves he gives Rus a meal and offers to allow her to continue collecting in his field like any other pauper (granted he allows her to take more than her fair share, and offers her protection from harm). Furthermore Naomi is Boaz's sister-in-law, per Bava Basra 91a which lists Elimelech and Boaz as brothers, yet there is no record of him ever having a single conversation with her?
Granted in the end, after much cajoling from Rus, Boaz marries her, but for Boaz, possible the leader of his generation, not to treat his impoverished family with more mercy and hospitality is surprising to me. Do any of the commentaries speak about why Boaz wasn't more directly nice or helpful to Naomi and Rus?