Should I tell him I love him?

Many moons ago (over 16 years) I had a relationship with a married man. I really fell for him, but he broke it off to give his marriage a fair chance. I brokenhearted, moved on, but over the years I have always thought of him and never felt less then love for him. I thought that perhaps I was too young , or that I had in my mind made it more then what it was. A little while back I happened to bump into him, we had started chatting and catching up. I was again saddened to hear that he just lost his wife two years ago to cancer, and is having a very hard time coping. I am just out of a marriage, and not really interested in another relationship. I suggested we could be "fwb" and that was okay the first time we hooked up. Then we hooked up again, and our feelings for each other seemed to take over, it was intense. I have always loved him, but never told him (sure I admitted I "cared" but I never said "I love you") He has asked me to leave him be, he said that after we were together he was overwhelmed with guilt, that he is not over his wife's death, and being with me just seems wrong. I respect that, but there is a part of me that wants to tell him how much I really care, and I know it won't change anything. But another part of me is convinced that that is futile and will only hurt him more. So....Do I tell him or do I just let him go, and never really let him know? I am not a kid anymore, and this is real life not a fairy tale. Do I follow my heart or my logic?