Dates are a big part of a relationship. Even if it's something as simple as taking a walk through the park, it can be what holds a relationship together. If you have a girl, take her out. You don't have to spend extravagant amounts of money. Take the dog for a walk together. Go on a day hike. Cook a decent dinner for her (the best thing you know how to cook) and watch a movie. She will appreciate the simple things, and be happy to have them, and in turn, to have you.
And girls, don't expect your dude to spend extravagant amounts of money on you. If you expect diamonds and shit for your birthday/valentines/whatever, you need to get your fucking priorities in order. Also, don't expect your dude to take you shopping. Take your own damn self shopping. We don't have boatloads of extra cash to buy you that $60 skirt and shit.