to flirt or not to flirt

so this guy i meet 4yr.s ago in 10th grade is my best guy friend i always knew he had a crush on me but i never really liked him that way so i kept him in the friend zone anyways we recently got back in touch in june and he told me he had a crush on me we talked for awhile after that then talk turned into flirting and that turned into pic.s of his dick and my tits but it was a one time thing that we agreed would not happen again then we went back to talking and flirting anyways we hung out once at the galleria a few of weeks ago and now he wants to hang out again. but at his house we joke around about what we would do and how his mom would react to the sounds coming from his bedroom. but idk if it really is a joke to him i think he thinks he might actually have a chance at something....i told him we could never do anything that these were just words and he said yeah just words but im so nervous that he will try to put some moves on me that i keep coming up with excuses on why we cant hang out when we plan a day to hang 😬😬😬😬