He likes me but im not in to him and i was venerable?

ok they guy i want to spend every day with is not around for a few wks and we decide to be just friends for now . well my neighbor is really into me and i was venerable so i ened up hookn up with him and now i thinks he thinks just cuz of that nite that were somethink or fwb but i dont want any of it and im a soft heart person so how to tell him with out him getn pissed and what not ...am to im not sure what to do and ill be move a few miles away next wk but he has my address i hopn wont be comn over alot b/c the guy i love will be back i regret that nite with him and im not even lookn for a bf or anything i jus want to be singlei start college in nov. what do i do i now i ws stupied for that nite plz dont lecture me im 18