how to know if a boys hinting at sex

Maya
So there's this guy that in 8th grade I was close to. He asked me out several times but I said that I wasn't ready for a boy friend. We aren't in the same schools anymore but we still text and he sent me these pictures. 
I haven't seen this guy in person for over a year but do you think he's trying to hint at sending each other body pics or to have phone or text sex or something? I'm really freaking out bec were friends and I don't want to make it weird by hurting him or assuming something that's not true.