Just be honest with him....If I were you, I would have emailed him that I'm still having feelings for him and this is bothering me that he's contacting me like this....and tell him that you are in dating process and he takes your focus away....tell him whatever it's in your mind and whatever it's bothering you....and tell him to stop contacting you till he figures out what he wants....
I think this way you can get rid of all these drama....I hope he answers you....