Talkative stranger nearly ruined my romantic nature walk

Dear Eric: I was recently on a lovely group nature walk with a friend, whom I hoped to become something more with. The exercise and environment were romantic; the conversation was good and that continued for about three quarters of the walk.

Then, a man joined us on a break and started talking ... and talking and talking. If I tried providing minimal responses or no follow-up questions, he just glommed onto my date and peppered them with questions and commentary nonstop.