Too lazy to think, but the first thing that comes to mind is... if you weren't married, would you go out on dates with her? If the answer is yes, then she's most likely GFE. If you wouldn't take her out and court her, then she's not GFE material.
I like it when a person wants to plan our evening or asks me to plan our evening. I like doing that. I like to be in charge and say this is what we're doing and this is what it will cost. I like having a man surprise me with plans for our evening or afternoon and just look at my rates and have a number in mind and then surprise me entirely going from point A to point B.
I like gifts. I know most gentlemen cannot take things home with them, so returning the favor of giving gifts doesn't always work, but I like buying really neat lingerie or outfits and looking good with you and for you. It is fun for me to surprise you by going out of my way and looking drop dead sexy for our evening. I like to look like a knock out for an evening on the town. It is something I enjoy doing so very much.
In normal relationships, well... what I would call normal... you communicate. You chat back and forth, have a little fun, have a little space. I think if you want to be a non-GFE hooker then limit all communications to business, strictly confirming dates and times and nothing else. But if you want to be GFE, have fun with it and send playful, complimentary emails back and forth. Make each other feel important.
A variety of time. If I were a girlfriend, I wouldn't only see you intimately nor would I only go out in public with you, I would probably be doing both. We would go out sometime, stay in sometime, things wouldn't be forced or pressured or done as if a job. I think having a no-list is the biggest piece that eliminates a provider from being GFE. If she says no that is something I don't do, that's a close-minded way of thinking and maybe she's like that in real life; but if it's something new to me, I don't tell you no and then turn around and tell my boyfriend yes.
In short, I think GFE, girlfriend experience, is when being together feels like spending time with a really fucking cool chic. When you can think back and say damn, she's really fucking cool. I don't think GFE is limited to a service, but an attitude and perspective.