The reason there shouldn't be withdrawal of report provision.
Let us assume I reported a particular user's posts and say about it and the user meets me in dm and convinced me about the reported post. What next will I do, maybe I will withdraw the report since it hasn't been handled.
the question is how to know he was reported by you?,
Because I got a lot of posts deleted (about 30-40 posts), Until now, I still don't know who reporter my post.
You don't need to know who reported your post, if your posts are getting deleted its probably for spam or low value on which you should be concentrate and how to avoid such reports in future.
About the topic even if you reported your own post by mistake, you are supposed to give a reason while reporting right so what's that. Mods will decide about the wrong reporting and mostly it will be marked as bad when you report a good post of yourself or others but the fact is you no need to worry about the bad reports especially only with 1 of your total 3.