While you're talking to him, just and find some common ground to show you guys have similiar interests, and just pay him alot of attention and compliment him every now and then to make him feel special. :) And of course, flirt.
If he's like you three times before, I'm sure it won't be that hard to get him to like you again.
Then if you feel comfortable enough doing it, maybe after awhile of talking to eachother and flirting and whatnot, tell him that you have feelings for him.
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