How to get my rims back (bmx-wise)?

me and my friend traded bike rims and 2 days after we traded he and everyone else was saying i was stupid he said they were whopped* kinda and didnt tell me when we traded and also he told me i was going to never going to get them back btw im a teen just in case i dont want to get the police or parents involved because i dont want to be labeled as the neighborhood snitch.. but plz how can i get them back