Should I continue communicating with this person?

Phoning, texting, chatting, emailing, &c, can be nice amusements and occupations to while away empty afternoons and evenings. But no matter how appealing someone may seem via this sort of remote communication, that someone can still be damned UN-appealing in real life. And then all that phoning, texting, chatting, emailing turns out to have been a waste of time. 

Date Sites are a waste of time only if you choose to waste your time on that kind of phoning, texting, chatting, emailing. You're there to MEET people, not to fritter away your time on phoning, texting, chatting, emailing. So MEET this guy. Meet him for coffee.

Never plan a DATE with guy you haven't met yet. You could be stuck for hours with someone you much like. Plan to spend 20 minutes meeting over coffee and then you'll both know whether or not planning a date is a good idea. All that "getting to know each other" when no real life meeting is in the works is leading yourselves and each other on, wasting your own and each others' time. Either meet or decide to not meet, but meeting is the ONLY way to know whether you want to date this guy. 

thats up to you

Being upfront about what type of relationship you're seeking is the appropriate thing to do.  Did you put that on your profile?

As long as you are clear you are only seeking friendship, it is perfectly acceptable.  Telling him you aren't sure if you have a romantic connection leaves a possibility of hope that you could be more, so you need to address that it doesn't exist.  And if your friendship blossoms to something more you can clarify that too later on.