Charles,
If my wife read this she would probably get all teary eyed.
One thing I've learned in the 50 odd years I've been around (and yes we do know more with age) is that you need to live your life with as few regrets as possible, especially when it comes to affairs of the heart.
I'll agree with Sean that you don't want to overwhelm her, but it seems to me that she has to have more than a minor interest if she's spending that much time with you. I say strike while the iron is hot and before she develops to much of a relationship with the other guy. Just my 2 cents.
