According to a new report by Star magazine, the 29-year-old hunk and Jenna, 28, met in August while in New York City and spent the night together — only for Sean to completely ignore her the next day.
"Sean, Jenna and a bunch of other Bachelor and Bachelorette contestants converged in New York City the last weekend in August for a charity event. Sean and Jenna had never met before, and they really hit it off," a source told Star.
"Jenna went back with Sean to his hotel room and stayed the night. The next evening, at the charity event in Philadelphia, Sean barely paid any attention to her — like she wasn't even there. It was a side of Sean I never thought I'd see. And it really hurt Jenna."
To find out how Jenna reacted to the incident, pick up the latest issue of Star magazine, on newsstands Thursday.