Rick was waiting for Jess to answer as he held her when she pushed him back.
Jeff/Jess had gotten ahold of herself and was able to push the feelings she had for Rick away so when she pushed away from Rick she said "I'm sorry, Rick but this is not going to work" as she turned to go back through the passage.
"But why" Rick said as Jess got down and started crawl out of the Lagoon.
Jess stopped for a second as she tried to come up with an excuse but all she said was "you wouldn't believe me if I told you, so just leave it at that."
Rick did not like that answer "Jess I knew you have feelings for me I could see it in your eyes. So I think I deserve an answer."
Jess just said "Forget it" as she continued to crawl out.