This happens quite often actually. It's understandable. After all, you are spending intimate time with a person of the opposite sex and it's all fun isn't it? Of course affection is a side effect.
I doubt that you have spent a day working in the heat with her have you? Probably haven't painted a house, attended a relatives funeral, washed a car, cleaned up a nasty mess or even had an argument.
You are living in a fantasy world with her and trying to move that fantasy over into your real world. You probably don't even know each other at all.
See what I am saying? It comes from experience.
As was stated before, run, don't walk. Or at least make a decent attempt to put things into perspective.