这个女孩真这么想吗？

Ms. Zhou remembers that follow-up differently. A few days passed before he called for a second date, she said. But the wait fueled her anticipation. “I was really attracted to him on that first date, and I wanted to see where it would take me,” she said.

It took her to some spectacular places: They saw a series of Broadway shows including “Jersey Boys”; went to top-tier restaurants in the city; and, toward the end of 2014, to Puerto Rico for a five-day vacation.

“That was when I realized I could spend a lot of time with Marc,” Ms. Zhou said. “It was just the two of us for an extended period of time, and we didn‘t get on each other’s nerves.” By then, Ms. Zhou considered their relationship exclusive. Dr. Wallack did not. But that was changing.

“One of the mornings I woke up in San Juan, she had made tea in the hotel room,” Dr. Wallack said. “And that made me feel so wonderful. I thought it was so elegant. After that trip I fell in love with her.