500 texts? Like you're sending 500 messages back and forth? If that's not a misstatement, than clearly the problem is that you're not asking them out and they're taking that as lack of interest/seriousness. I've gotten a lot of dates off of OKC, and my rule is to ask them out by the 3rd message if they seem interesting, as prolonged texting without any payoff isn't appealing to most people.
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“The totally convinced and the totally stupid have too much in common for the resemblance to be accidental.”
-- Robert Anton Wilson