Platonic relationship or more?

So, I (25F) have a friend (28M) from grade school. We have known each other now for 16 years with 13 of them being long distance. We kept in contact (msg/calls) at very irregular intervals.. sometimes not speaking for years yet somehow we always found each other again and again. The relationship has always been platonic but also flirtatious.. if that makes sense?

Now, fast forward to a couple of months ago we started speaking again.
This time around our conversations were heavily about life and the future of us meeting again, spending time together and sharing goals (presumably in a platonic manner). Stupidly enough it made me « feel some type of way » and got me questioning how i should approach this going forward while avoiding any catastrophic scenario when we meet up.

It’s really difficult for me to decipher whether this feeling is shared or one sided and the wait is making me very nervous and confused. What to do?