can you guys help me?

so i have this guy bsf for like a year now and a few months ago he confesses that he liked me. Although he was rushing things and kept asking if i wanted to be his gf, i rejected him politely. He moved on from his confession but we don't have the same kind of relationship we had before his confession. I messaged him earlier and his answers were a lot shorter and colder. I want to have the friendship we had back then but idk how to talk to him.