Hi bakasi,
The two that I always thought had more potential for advancing the romance were the hug after Trask was shot in "Green Green Glow of Home" and the scene in "All Shook Up" where Lois verbally stumbled, telling Clark that she loves him... like a brother. The final three episodes, except for the scene where they hug as Lex is falling and maybe the final scene after Clark lied, crossed his fingers and left, and she told both him and Superman as he flew overhead that she's not done with either one of them, seemed to destroy that camaraderie.
Hope this helps.
