There is a shit load of guys out there that are desperate to the point, where they'll take any girl as their GF. A big challenge as an average guy is to convince the girl that you're not one of those guys.

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While she enjoyed the "forever after" fantasy in the moment, I'm guessing that afterwards she thought that you're another one of those guys. Falling immediately for a random girl you just met.

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Even tho women will tell you that they want someone that is serious and wants a relationship .. The point is that you're supposed to say "I definately want a relationship", but add a "with you" to that sentence and you'll likely get a relationship.

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I suspect that this might have killed you off:

"Oh, ok I guess we're doing this."