Guy trouble need help asap!!!?

Well i let my friend use my phone and she txted her guy friend... And well he txted whn i was on the bus and i told him that she dident have my phone anymore and well he kept txtin and after like the 3rd txt he asked me 4 a pic so i asked for 1 from him first. And he gave it to me so i gave it to him ( yes clothes were on) and now hes askin for nude pics of me and he just txted me sayin plz and i dont know what to do anymore because i dont want 2 cuz im not that kind of girl finally i snapped and was like ur beggin like a 3 yr old i said no cant u respect tht he said yea and noot even twenty minutes later he was askin again so i wanted to stall and i said im i have pudge on my tummy and i want to get skinnier and hes like can i have befor and after shots of you and im like no besides mabey in the summer because im white as a ghost so i really dont know what to do any advice should i give it to him or should i not should i tell my parents or should i keep it to myself? Thx in advance... For the advice