You've got an awful frame bro but I think that it's pretty normal because of the movies and advice about women we get from other women.
First thing you shouldn't be taking it all seriously. If it works out between you two then it does and it if doesnt it doesn't.
Second I wouldn't even consider doing anything outrageous to win her over romantically (no flowers, gifts, romantic dinner dates, etc etc) until you guys have fucked. Have you fucked?
If you haven't take her out to drinks and then bring her back to your pad. Escalate and see where it goes.
She already knows if she's going to sleep with you or not, all you have to do is find out what the answer is.
The best thing you can do right now is not get stuck on 1 girl and talk to as many other girls as you can. This makes you more sexually attractive to other girls than anything else.
Listen to the man. I've already gathered from a post here and there that Andrew knows his shit and has a solid background in this stuff.
You can't approach things with the attitude of "I really want
this specific girl". Have fun with it, enjoy finding out what she's all about ('cuz I'm sure there's
a lot you don't know about her), but always keep in mind that she is just one of millions upon millions of attractive girls you can get with. Even if you don't want to, I'd go out and meet other girls just to remind yourself of that so you don't get all needy with this girl. Girls can smell if you've got other options, they're like wolves. They can even smell the difference via text message, the shit gets that subtle. So there's nothing you can really
do as in player tricks, but you can just live in a way that makes you non-needy. For now I think the quickest way to do that is hit a bar and meets some more girls. If you live in buttfuck nowhere then even an online dating site will help to a certain extent. You might even meet someone better than this chick and wonder why you were so keen in the first place.
edit: on second read I see that you've already got this girl. So I assume you've fucked her and you want to keep her. But I think it's the same anyway. Girls will keep someone who is in demand. So even if you're exclusive with your girl and not "picking up" others, still being social and knowing people (including girls!) at the places you go to, being well-liked in your circle, being the center of attention sometimes (like, you could organize some outings or gatherings for your friends -- that is
really attractive, 'cuz you're the leader), being friendly and outgoing with new people you meet so she can see other people's good reactions to you, etc. All that good feedback she sees from people around you makes her like you more and want to hold onto you so none of those other people can get you.
I've been out of the field for like 6 months just doing IM so I'm living vicariously through you. lol