"How do I go to tell him
that I don't want to get back together with him after I
basically lead him on?"
Don't worry it's not confusing at all, I proofread SOOO
many people's writing all the time, I'm use to it by now,
reading unproperly worded senteces I mean.
Tell him --straight
out-- that you don't want that with him, he should understand,
and if he can't accept that, then you probably shouldn't be
friends with him.