You get caught sending him pain killers (and you will), you'll most likely end up serving a nice prison sentence.
I will give his contact to a drug dealer then
If I were you, I'd just right off both the money and your ex. Neither are worthy of your time and effort.
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What if I give his contact to a drug dealer?
You want to prove that you are just as low and worthless as he is?
No, I just want him to pay for what he did to me
How will that help you? Actually, it sounds like you don't want to let go of him.