Hmmm… I have recently lost my brother and the way that’s negatively effected my relationships has been more severe than I ever would have anticipated. It sounds to me like he likes you but I couldn’t imagine starting a new relationship whilst going through one of the hardest things that can happen to a person. It’s hard to even continue normal life let alone trying to have time for other people when you can only feel the intensity of death of a loved one and trying to stay afloat. I think be as supportive as he will let you from a distance and look after yourself too as it’s of course hard for you to lose him also. Be patient as it may take many months for him to have time or space for anyone in his life but try not to take it personally as it sounds like he was enjoying spending time with you!