UPDATE TO A PRIOR POST: I CANNOT TELL IF I AM ACTUALLY BISEXUAL OR IF I'M JUST PLATONICALLY FOND OF THE GUY AND THEREFORE FIND HIS FLIRTING ENDEARING. I'M TOO OLD TO BE THIS CONFUSED ABOUT MYSELF! HAHA.
My advice? Don't even bother with a label for yourself. Just keep goin' how you are. If you wanna reciprocate--do! If not, just enjoy the flattery and don't worry about anything
Well it's not leading him on if you're testing the waters of how you feel about all of it. I'd ask yourself some questions: How would I feel if we went on a date? Do I want to kiss this person?
And if the answers are "I don't know" then you'll only know if you entertain it and get to a point where you do!
Just tell the guy "I enjoy your flirtations, I'm not sure if I swing that way, but I'd like to see where this goes" or something. Keep it simple!