I'll just reiterate what
@SWfloirda mentioned: that is NOT jade, it's portulacaria. P. Afra CAN be kept indoors - I do it - but it will need a decent grow light to be happy.
If you've ever kept cactus or aloe vera or other succulents as house plants successfully, treat this the same way. As
@LemonBonsai alluded to, these things are so easy to propagate from cuttings, you'll have plenty of opportunity to to keep trying.
To clarify, it's not the insecticide that hurt it, it's probably root rot. Make sure there are open drainage holes in the bottom of the pot. The soil looks like it's mostly or all peat. You'll want it in something that drains much better, and dries out a little faster, and water it less frequently. If you wind up replanting it as a cutting, change the soil.
Good luck!