I'd stop talking to him on this fake account immediately before he figures out it's you. Tell him somethings came up and you can't make it to meet him, then never reply again. Don't let him be stood up, that's cruel. You need to stop making fake accounts to speak to him, ether add him on your own account and try at your relationship again if you've still got feelings for him, or get over him and never talk to him again.
thats completely immature.