Am I being dramatic when I say that Aoharaido (Ao Haru Ride) is my favorite shoujo manga of all time (so far)? Maybe, but I seriously love this series and it has all the elements that tug at my heartstrings in a major way. I've finished this a long time ago (when the series was actually being serialized in Bessatsu Margaret), and I haven't quite found another shoujo that gives me the same feels as this had.
Before I go further - I know shoujo tropes are a very personal thing. We all have our own viewpoints and opinions and therefore some people hate love triangles and hate jealousy and all that. Well, I kinda love them (as long as it concludes in an ending that I like, of course). So I totally understand readers who hate that Kou acted out in jealousy so many times, or that Touma was a doormat for Futaba, etc. But the author, Sakisaka Io, really knows how to paint complex emotions that ebb and flow with time and circumstance, and I appreciate that she draws not only "perfect emotions," but an array of not-so-pretty emotions and how characters act out because of those emotions. This is totally rational (errr, irrational? But either way, normal) human behavior! This of course still has a very tidy, "pretty" ending, so there is that, but it does take you on quite a rollercoaster of highs and lows (and hair pulling and gut punching) throughout the 13 volumes.
If you are ok seeing jealousy, seeing main characters get into relationships with other sub-characters, and getting to each other in a very roundabout way, but at the same time seeing a ton of character growth and self-reflection happen along the way, then I highly recommend this series for you! I'm still waiting for a manga to come by and dethrone this as my top pick for shoujo.