Amazing. I’m sorry if this was too complicated for you. Let me repeat:
There is no indication whatsoever that drug dealer guy knew. This has been explained to you a couple of times by other people.
In fact the glaring absence of any indication can be interpreted as: no, drug dealer did not know. This has also been explained.
You, on the other hand, claim the revenge taken out by Anon in itself is proof that he knew. Because a cuckold will never attack the lover unless the lover knew what they were doing.
That would be cool if it were so but it just isn’t. The trope of the cuckold attacking the lover is older than humanity itself. You’ll find stories even (or rather especially) in Greek mythology where cuckolding or just fancying the wrong person leads to eternal punishment. Also by the age of 20 most of us witnessed similar behavior a couple of times. If you didn’t good for you / grey out of the basement more.
You are doing the equivalent of arguing that 1+1 does not equal 2.