Neil, I didn't find the "right one" the first time either.
But the experience and learning from the ones that didn't work out helped me to to be a better man for my Lao Po now, I wouldn't change how things went for anything now.
My Sunny is "the one" the friend, companion, lover that I want to spend the rest of my life with. If I hadn't that the previous experiences I would never have met her so all I am saying is be positive. I bet you have learned from the past too.
Brenda looks very pretty and maybe she will be the "one" for you, just enjoy the experience and if its right, then it will work out.