You would entanglement yourself even more if you use the techniques on him UNLESS you did the cutting the cord meditation afterwards. If you have let go of him I would not use anything on him for the time being. It's still working on him regardless of whether you continue or not. It will just slowly dissipate but you can reconnect anytime you choose. :-)
So I have let go of wanting my SP and I haven't done any RS techniques on him for months...but a part of me wants to do the technique just to prove that the technique works. I have no interest in hurting him or revenge--I'm not doing it from a negative place--and if he came around I would take him back BUT I am also afraid that if I start doing the techniques on him, my heart will get entangled again. Is it possible to do the techniques without forming an emotional attachment?