It does sound like he is dealing with some difficult issues, and is unable to see his way ahead where his life is concerned, let alone relationships, and this is totally understandable. This said, there is no reason why it has to be all or nothing between you both. He obviously cares for you, and you feel the same for him....this may be enough for now. Having someone for him to confide in and show him support is probably what he needs most right now.

Please be kind & generous to yourself and your friend karrissa, who knows what the future may hold.