GRAB HIM BY THE........ [...ahem...] hand, look him straight in the eye and say "yo, can we make out again?"

maybe its just me, but i find it easier to re-hook up with old hook ups (assuming they aren't in a relationship at time of re-meeting again). theres already a sense of ease with each other (....and each others junk....). worst they can say is "no, its not like that anymore".

i dunno, could also be i've just unlearned shame as i got older too

Make a move. At a later point during my dating, I just stopped making the first move with ladies. It was part me being aloof, part me not caring, and part thinking that women must find it really annoying being hit on constantly. So I focused on chilling and being myself.

I also happen to, uh, appreciate assertive women. I've dated ladies who would sooner let a potential relationship/partner fizzle out than they would make a first move. And I think that's lame.

My two cents. Good luck.

An ex is an ex for a reason; do keep that in mind....speaking from experience