Loneliness Support Group
Loneliness is an emotional state in which a person experiences a powerful feeling of emptiness and isolation. Loneliness is more than the feeling of wanting company or wanting to do something with another person. Loneliness is a feeling of being cut off, disconnected and alienated from other people. The lonely person may find it difficult or even impossible to have any...

So long as she's dating I'd say don't mention how you feel about her.
Wouldn't it be better to meet a gal at a comic con (I read a bit about you) who doesn't have a kid or kids and who's totally into you? Even then go slow and don't reveal too soon how you feel about her. Basically, if something works, it works!
Good luck! girlschase.com had a few interesting articles you may like to read. e.g. don't look for a relationship, look for dates...stuff, like that. I wouldn't pay for the course myself.
Robotnik, you're probably right about all of that. It wouldn't be my place to just pop into her life after a few years and say how I feel when she's currently with someone. It'd be awkward and just not cool on my part. It might be better to meet someone at a con one day. I mean, as you said, she might not have kids and we'd know we like some of the same things. It's just hard to NOT feel something for someone when they keep coming back, you know?