Ummm... YEAH!
What the heck is WRONG with those two???
There's a perspective that we don't get a lot of even when Jake or Cassie are narrating - their relationship... it's like a big no-no to talk about for them for almost the entire series...
(I guess that makes sense, though, given that they are young teenagers, and as I can personally attest to, relationships at that age are already incredibly over-complicated by numerous factors... Throw in an alien invasion, gory battles, and bizarre capabilities, and you have one sewiouswy messed up mix)