ugh....really

i had this thing with this super sweet guy, and then once he finally asked me out i was so nervous i said no and i didn’t want him to think i was switching up on him and say yes again later and so we aren’t even friends and i miss having that kinda of relationship a someone. and it’s been like 3 months since this has happened, i’m not over him but he says he’s over me and i dont know what to do i need help!