I agree with Ginger but I also know most people get that huge sense of relief after being in pain for months when a new person expresses interest. The brain chemicals and endorphins trick us in to believing this person was an angel sent from God and that they are an ideal partner. The honeymoon stage is very addictive.
While I don't agree you are anywhere near ready to date, I also know you have convinced yourself that you are ready and will act accordingly.
That being said, be very careful Steve. Go super slow and keep your attachment (you are a codependent btw) to a minimum. If this relationship does not work out as planned, all that pain that you experienced with your WW leaving will come rushing back 10 fold.
Also, do not stop going to therapy and working on yourself. You are as broken as your WW is and need therapy to work through your core issues. This will only serve to help your relationship with the new girl if you keep Steve and your healing as priority #1.
Tread carefully man. We've seen this a million times here, and 99% of the time it doesn't end well.