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The detective needs an official statement from the victim and will ask you again if you want to pursue charges and once he gets this statement and completes his case it will be submitted to the DA for decision on charges and prosecution.
Each officer has their own discretion in how to complete an investigation and when or whether to make an arrest.
He should indeed get the witness statements as well to present to the DA as part of the case. What it seems is that your case is not as important to the detective as perhaps other cases he might have to deal with, which is why he seems to be giving it not as much attention as you might like. However, what you describe is also not uncommon or improper in these cases either.
If the detective continues to not pursue your matter properly, you can go to his supervisor and discuss your concerns with his commander to determine why he is acting this way.
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