My husband is a very shy guy and we hardly talk at home. However, her has a lot to talk to on the phone with his parents and other friends. What could be the reason for his aloofness?

try and talk to him in small and simple conversational topics that are more generic, for instance your day, work and so on. find common interests that you both can talk about. make plans for the two of you and surprise him, arrange a romantic dinner at home, or plan a day out.