when I got my licence I was not ready to take passengers, I wanted to get a bit of experience while I only had myself to worry about. I did, however, take to flying off with my tent and camping away, the first time was on the day my newly gained licence came through the letterbox.
My partner was not at all keen to fly (with me or anyone else, even commercial) but did concede that she worried about me while I was away. After 3 or 4 years she began to realise that I would go off flying and come back without injury or damage and often visited some interesting places. She eventually came and had a short ride in the aircraft, saw the relaxed expression on my face and enjoyed the flight. She has been all over with me ever since. I heard her explain it to her parents "it is better to be with him than sitting at home worrying about him".
For my part, I try to make the flight interesting. I adjust the route to pass over interesting features on the ground, white horses, nice houses, crop circles, steam railway lines, big rivers, castles, follies, harbours etc. I also fly low enough that we get a good view and have been known to circle round while she points her camera. I usually try to fly to places where something is happening, if I am just flying around for the sake of flying I go on my own. We generally try to get away from the destination airfield and explore rather than stop at the airfield cafe, keep it interesting.
This brings another point to mind. We have two aircraft, an old Rans S6, high wing, 65 mph, good view down and around, good for taking photos from and a Zenair 601ul, low wing, 90mph, bubble canopy, poor view down, canopy too close to your face for SLR camera with long lens. Guess which we prefer to fly about in. Yup, the Rans is better for enjoying the view and the trip.
Don't rush your partner into it, let them get used to the idea at their own pace and then do more than just fly.
Rans6..