According to The Secret Circle star Britt Robinson~Cassie Blake, a deeper connection between Cassie and Nick may be coming soon. That would make for some serious tension in the circle, but that's what it's all about, now isn't it ;)
"It's very, very possible," Britt Robertson says very, very coyly. "Cassie and the Armstrong family will have some sort of relationship blossom."
Source: TV Guide