Hachimitsu to Clover, KimiKiss Pure Rouge Recommendations
The animes both deal with romance and the caused problems.
Though there're not quite the same of the content, the way of telling the relationships between the people is similar, you could say that's the biggest commonness: Both tell the story of a group of people, somehow all together related, and somehow not.
Each person deals with his own problems, feelings, triangle-relationships and future and both are very good romance animes.
One main difference is, that in Honey and Clover you're more into the boys side, in Kimi-Kiss on the girls.
If you like a story, with a whole bunch of people dealing with love and