What could this mean?

This week a local teenager got shot and died. Everyone was stunned because he was jist at school that day, living it like any other day. I talked about this with my boyfriend and how it made me realize how much I cherish him and how badly I do not want to lose him in my life. Like I would dread it if he died. While I told him this my head was buried in his chest so I couldn't see his facial expression. He simply said nothing. I let the silence go on until he kissed my forehead and went to the restroom. Its confusing because he has told me he would do anything for me,cares a lot about me, and that he wants to have a future with me, that he loves me, even that he lives for me. So you'd think he would respond with something. Instead there was a sorta awkward silence between us. Did I go too far? Is it his depression?