Partly that, yeah. While this series doesn't strike me as super
deadly serious, it does treat quite a few aspects of both realising you're gay (or at least that you're into a person of the same gender) and being in a relationship for the first time with a surprising degree of emotional depth. (A lot more than other, better-known titles IMO - one reason I started reading it/wanted to try this.) There's some great chapters later on that go into the idea even the smallest "But what if they...?" can leave you a nervous wreck, even if you know you're probably over-reacting.
That and, well, teenagers do stupid stuff. I admit I've caught myself thinking "Oh, for God's sake" a few times working on this, and I have to remind myself "Well, yeah, that's kind of how it was, right? How
you were?" (I am no longer a teenager.) Still, if you get annoyed easily reading about people acting in ways which are not always in their best interests, this may not be the series for you.