Sylar
Do you want to tell her that you WERE that man or that you ARE that man?
If you don't tell her, someone else will. You said yourself that people here know who you are. You can't hide those secrets forever. It would be better to tell her yourself and let her remember her childhood with a man that she knew to be a good person. If you're not that good person now, she won't have anything to base it off of.