I know how you feel! I have done this exact same thing, to be wracked with guilt for the rest of the day and a feeling of failure. I think you are feeling this way because you are a very kind, helpful, compassionate woman who happens to have learned the true meaning of fear. Let it go, there are other people who are in the world who could have satisfied his possible needs. I used to feel guilty when I was driving if I saw a homeless man hitchhiking etc. and I would have my daughter (as a baby) in the backseat, feeling guilty because I was afraid the man would murder us or something. Then I came to peace that I help when it is appropriate for my situation and safe for me and my family. You did the right thing.