Need Reality Check

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I am frustrated and really could use some help . . . my bike partner and I went on a ride this weekend. We both have new road bikes - It took us 4 ½ hours to ride 42 miles. (Now, the ride was an easy ride) While on the ride, she kept stopping to eat and at least every ten miles would stop to go to the bathroom. (She indicates that this is a sign she is fully hydrated and indicates because I am not that I need to drink more, even though I am drinking plenty of water) When I attempt to discuss biking with her she reminds me that the male she is dating has ridden 75 century rides (oh, did I share with you that he stops home and takes naps during his ride). I am struggling because I don’t have any other bike partners. Please provide me with a reality check / suggestions as to approach the topic . . . anyone?

Thanks
In the saddle toooooo long