I am so sorry you are going through this, It is very hard to love someone, and that person dose not love you back. I was in a 4 year relationship where I was in love, but he wasnt and he never would be. It took me about 6 months to actually get up the courage to leave. It hurt, I spent a lot of nights crying myself to sleep, blaming myself for staying so long, I fooled myself into believe it would be more then it would ever be ( I tend to do that with everything I do), He told me at the very beginning that he didnt want to be with me in that way, but I held on. I dont blame him, I dont hate him, but I had to move on . Now that I am in another relationship that is mutual in love, although its not the best relationship I hold on tightly not letting it slip through my fingers. I know that after losing your Husband, you never thought you would find someone, and when you did, you did the same as me, you are holding on. I know its hard to hear that Im sorry.
Some men are just not sensitive, they do not understand female and all of our emotions. Hang in there, have a serious talk with him and let him know how you feel, and what you want to become of the relationship, if you both are on different pages, it might be time to start detaching, its a long process. Baby steps.
Best Wishes