Most love problems could be solved with a simple orgy....just sayin
On a more serious note: I'm a little torn with Kaoru's character. Personally, I don't like the flirtatious types, especially if they actually manage to get multiple girls/guys with their flirting mind games. But reading through the comments i noticed Tamahime makes a good argument. Kaoru realizes she missed out on a great girlfriend like Shizuka and is trying (in her own way) to get her back. I do agree that people should get more chances in a relationship that doesn't go so well the first time, but you can only give a person but so many chances. At that point its best to realize that one should move on in a relationship, forgive but never forget ya know?