Supervisor using my dataset without my consent to submit papers with his other students
I don't see anything problematic here, unless the papers that your advisor wrote with the other students take credit for developing the dataset (which would be a clear ethical violation).
Many papers in computer science use one or several datasets developed by other authors, and it's not a standard practice that the dataset developers are invited to contribute as authors. In fact, doing so may lead to vastly inflated author lists for papers that use many datasets.