As I've said before, we believe most people play these games to enjoy them. There will be painful paths, but they should be pretty obvious. I know I personally hate it when I'm playing a VN and I've been exploring multiple paths and suddenly one of the characters I've begun to care about is devastated when she finds out about another one.
In general, and as stated in the updated primer, the player should have a *REALLY* good idea when he's making a choice that will blow up in his face. It's common sense, really. If you tell a girl you're exclusive, and then you cheat...She's going to be hurt and upset. If you're testing the waters and haven't put a label on it, you're probably pretty safe.
Remember, Love points are a general measure of affection...It doesn't have to be romantic. Choosing a relationship won't be a case of magically exceeding X number of love points and then being locked in. A high-Love Jaye can still just be your friend, but I believe it's important for there to be ways to close a path without being an asshole as well.