Should I stay or should I go?

I have been married to my wife for 8 years and we have a 3 year old son together. I am not happy and told her I am considering divorce. She was devastated and said she will do anything to save our marriage and that I am the only man for her. I do not feel the same way, but have decided to stick it out for a little while longer to see if my feelings change. I never really had that "in love" feeling like she did when we first met and I constantly think about being with other women. It's hard to admit, but I think I made a mistake in marrying her. We hit it off immediately and were pretty much inseparable for the first couple years, but not because of love (at least from my perspective) but because we were best friends. It was also my first real adult relationship, meaning she didn't live with her parents, had a career, and treated me like a man not a boy. That combined with the freaky sex had me hooked, which I suppose you could say clouded my judgement. Another issue I had (and still have) prior to meeting her was the fear of rejection. All my life I have been let down when it comes to girls. I guess I was always attracted to girls that were out of my league and always had to settle for less. I learned to accept this and now it has led me into a marriage not based on love but friendship. I remember thinking early on that although I am not "in love" with this person, being with this person will be safe because she won't hurt me or leave me, and if she does it won't devastate me as much as it would if I were truly in love. It sounds ridiculous, but it's true. Unfortunately, now it has led me into a marriage where I am not happy or in love and we have a child together. She loves me unconditionally, but I just can't reciprocate--the feelings just aren't there. I basically married my best friend of the opposite sex and feel more like brother and sister than lovers. The deep feelings were never there and I figured they would eventually come, but they have not. I am still relatively young and feel like I need to move on. Thinking of being apart from her and dating other women makes me extremely excited, but I'm trying to understand whether this is just a normal feeling that everyone has when in a long-term relationship, or if it's due to the fact that I made a big mistake and need to find someone I can truly fall in love with. I need to make a decision in the near future because it will only get more difficult to leave as more time passes.

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