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First you need to makeup your mind and decide if this is worth trying to work out with him or not.
If you still want to date him but his attachment is off putting, then you need to have a very frank discussion with him about how you do still like him but you need space and not rush things.
And again if you decide you don't want to bewith him, be open and TELL HIM. Don't play games and try and get him 'less interested' just tell it to him straight - you don't like him as much as he likes you and you don't want to pursue a relationship anymore. Don't offer to keep in touch and be friends because I guarantee he will still think he has a shot with you and will keep asking for second chances.