and he also tried to kill her. You shouldn't like someone even though they attempted to kill you. That's why she's so obsessive! Obsessive to the point she's latching on to him. So don't call obsession love because love is different than being a fangirl and that's what it is.
You do realize that obsession is a facet of love, right? It's just an unhealthy and suffocating form, which is destructive in nature. It stands in opposition to Adoration. Both are advanced forms of love. Another is the spiritual love, that clearly transcends both. I don't know why you or anyone else would weigh love in such a simple manner. But in all its honesty, Naruto and Itachi are the only ones who have put everything below Sasuke. And that folks, is real love.
Sakura was ready to sacrifice Sasuke for Konoha. Her adoration is just physical it seems and clearly pales in comparison to what Itachi and Naruto have done. She's just a tag-along idiot, who wanted his D. This maybe harsh, but it's the truth. Once you decide to kill someone for nationalistic reasons, you obviously lack purity in your feelings as they are driven by rational thought, when Love is an abstraction outside the realm of rationality.
Both Karin and Sakura - together with Ino - are unfit to call their crushes, love.