Nothing is jeopardized yet. No need to hit the panic button. There is nothing wrong with telling a girl that you guys are having a good vibe, you're feeling her and would like to continue kicking it again. Nothing is wrong with that....
It is when you are sappy, needy, calling her a milion times, and professing your love for her from the get go..thats when you screwed it up.
The best way to flip the script is to call the chick, and either with her on the line or leaving a message on her phone say this:
"yea...it was really great hanging out with you last saturday night...I'd really like to do it again this comming weekend but my friend Angie really wanted to take me to see The Ring 2 at the theater on Friday...and Saturday night I'm going out with the fellas...you know..guys night out...drinks, girls, strippers..hahaha.. you know...So when a day opens up...I'll let you know.."
What you have to do now is use a lil smoke and mirrors. Let her know that you do feel her vibe, but, you are a busy guy that is desired by many people. She must earn your time now.
Did you blow it? Nah. But, it all comes down to your patience now...you need to back off a lil bit.