I totally agree with Shelle...This guy is a nice guy, but you are not attracted to him and you kinda misleading him....honesty is the best thing ever....He might not like it, but at least you feel good about yourself not wasting his time....
I know exactly what you feel....I've been in your position so many times....When the guy was the perfect gentleman and everything was fine with him, but I didn't have the feelings for him....Then I can't kiss him at all and months can go without any sexual contact!!!!
Before, I was forcing myself to go out with the guy and giving him more chance as you know friends always suggest, but now I don't do that....It's not fair to the other person either....If I go out for couple of times and I don't see the chemistry there....Then I simply end it....
Also, one more thing....guys don't like rejection at all, so they get crazy when they get rejected......he even tells you in his email....
Be honest with him and tell him that you are not that attracted to him and you can just be his friend....although, I don't think the friendship will work at all, because he has feelings for you!
good luck
Marjan