I had unprotected sex with someone and he texted me that he was worried i had given him a disease. in the pics he sent there were a group of small white pimples on the shaft. then i inspected myself and there are small white pimples forming on my volva as

STD : In general those are signs and symptoms of an STD herpes calmly presents this way. Always practice safe sex and be monogamous this is the best way to avoid STDs. For specific diagnosis and treatment see a doctor in person

Get seen together: If these are painful, it may be herpes though this is not the classic story. If not, chances are this is the result of physical irritation. Since this concerns you both and clear communication is critical, consider being seen as a couple.