altered boy

I have been married for 15 years to a very wonderful Woman. Recently, I met another women who was in attendance in a seminar I was giving. We had some very good conversation during this seminar, and we hit it off on a couple of different levels. I had dinner with this lady, and continued the dialog that started during my seminar. I did not think very much about it, In fact, my wife is aware of this lady, and that we talk on a somewhat regular basis. The lady works for the same company I do, so my wife thinks that she is another one of my friends from work. Which is not entirely untrue.

My problem is that I am in love with this women. She knows that I have feelings towards her, and she even asked me at one point if I was in love with her. At that time, I told her "no"
She has been sort of vague about her feelings towards me, so I don't know what to think. She is a really neat person, and I love to talk to her, there are alot of things that I have told her that I cannot confide with my wife about. I consider her a very good friend, even though I have know her just four months, I feel that I have known her for years.

My marriage is not what I would call bad, Just boring. after 15 years, I guess we have fallen into some ruts. With my work schedule and the amount of time that I spend out of town, we don't have a lot of time together. We have one child, a 12 year old son, how for a lack of better words is very strong-willed. He can be a very big source of stress between my wife and myself at times.
I have been trying some different things, such as having "date night" every couple of weeks. Even if it is just for a few hours, It seems to help.
Still, The feelings of the other woman persists, I think about her most every day. I feel that I am in love with her. Because of the geographical distance between us, (Chicago and San Diego) I have not seen her since she left at the end of the seminar.
I would like to know if anyone else has has a simalar dilema and how they dealt with it.