Two possibilities:
1) When you met her, your 'stock dropped'. Either you didn't have a solid enough lifestyle that appeals to her, or you did return to old habits. Either way, she may have left that encounter less attracted to you than before you met.
2) You may have been too needy with the contacting her afterwards. It's okay, just back off a bit and let her jump through your hoops. It doesn't seem all is lost yet.
Either way, YES, it's a good idea to increase the possibilities. If we're still using the stock market as a metaphor, consider the advice EVERY stock broker gives a client:
Diversify
don't put all your eggs in one basket. Put your time not only towards multiple women, but yourself, your friends, and your lifestyle, so that way your world seems more attractive to the women you're meeting.
Hope this helps. Best of luck.