Too Much Interest

Is it just me or any time a girl shows way more interest in me than I am to her, its a sudden turn off for me.  Sometimes I’ll be into another girl who on paper isn’t even that beautiful or has that amazing of a personality but simply because they have been unavailable.  My friend told me during text he always waits 2x as long on the response time.  I think it has merit when you are just vibing with the girl. I would break that rule if its logistical related issues.