Girlfriend + Baby - Passion

Hey everyone, I was hoping to get some of your opinions. I've been with my girlfriend for about 6 years now, and we have a 2 year old together. We've had lots of ups and downs in our relationship (more downs than ups by far though) but we've sort of stuck together because we share ownership of a business together and can't really afford to split up. That's part of the reason I think we are still together, anyway. Since we've had a kid we haven't really fought much, and have generally gotten along, but we just don't have any passion in our relationship. Lately, I'm really realizing how she's not anywhere near my dream girl. I don't just mean in personality, but even in looks. I always had a thing for curvy women (she's not), and darker hair and skin (she's the opposite). Now, I know I chose her and all, but I feel like I just made the biggest mistake. She's sweet, I love her and she's a wonderful mother, but I'm worried that she's just not for me. The problem though, aside from being a bit financially stuck, is our son. I love him more than anything and I want to be a part of his life. And, I just don't know how to leave without ruining all of that. I grew up without a father too and I just don't want to create that for him. I want to be a part of his life, but I feel like it'll screw him up if I'm not there morning and night like I am now. But, what's better for him, and for me? That we stay together, loving each other, but passionless? Yet there for our son? I just don't have fun with her, we talk about our business (and in the last 2 years, our son), or we almost don't talk at all. I'm so torn, the selfish me wants to leave her and be there regularly for my son, the moral/responsible me wants to stick around, even if we have no passion, just because it's the right thing to do. Yet, I'm not sure that it is the right thing to do. Sorry for the rant. I'd love to hear some of your opinions on my situation.

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