Getting ignored

This boy asked me out on Tuesday and I said no, but he was pretty insistent and said that I could message him and we could go any time. I messaged him the next day and asked if he still wanted to go out and he ignored the message and hasn't opened it (but I know he's seen it because he's been online). Should I message him again or just leave it? I made a 30 minute trip back to my home town just in case he wanted to ://