Not your fault you don't like him.
You're both young it's natural just to have fun.

You left it too long to before you went out, if you just had a date earlier on he may have no as been as keep to see you and you wouldn't have had so many expectations of what he was like.

Don't feel guilty about him now though, he's in the past.
Just go have fun with someone else.. and perhaps don't turn it into a relationship.

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"As long as there's free will, idiots will never learn"