Serious I Don't Know What To Do?

So me and this boy yea we both like each other, that's all good whatever. Lately he has been asking me to send him pics like not dirty ones just pics of me....idt he meant it in a bad way. He had a gf and i confronted him about it and we worked things out, but i still dont really trust him. I want him to know that im a good girl and dont want to get into bad things, but how do i come across telling him that like how do i start up the convo? Please help, im so stuck and idw to talk to anyone else about this.