The guy I am dating says he is scared of me?

I know what he means when he says he is scared of me... he is falling for me and is scared because of past relationships and being hurt. I have made an effort not to be pushy or bug him or anything like that, I've just simply been there for him and he says I am really comfortable to talk and has opened up to me a lot. OK so I know this is a good sign but recently he has seemed like he has started to pull back a little bit... is it because he is scared of falling in love... or is he just falling out of interest... ? Is there anything I can do or say to help him relax and just take his time with it? And not run from me?