What you do to get them . . . . . . .?

There's an old saying that "what you do to get someone is the exact same thing tou have to do to keep them." Is this true? When me and my girl first got together I would always cook her dinner and really impress her with my way around a kitchen. Now, several years later, me cooking is expected. I have a hard time trying to show her how to cook. She'd just rather sit back and let me do most of it. If she does cook it nothing more than simple spaghetti or fried chicken. Honestly, are any of you who are in a long term relationship still doing the same things now that you were doing when you first met or do things change. Or do things not change and you adapt, grow and move on? My girl says we use to talk all the time which we did but we're much more busier now than then. I'm busier on my job and when I get home I'm tired. She wants me to come home and talk about my day. I've never done it so why start now. Do relationships change over time or do they stay the same?