Willow: Tara, I'm sorry
Tara: Don't, just don't. There's nothing you can say.
Willow I didn't mean to -
Tara: To WHAT? Violate my mind like that? How could you Willow, how could you after what Glory did to me.
Willow: Violate you? I didn't mean anything like that I just wanted us not to fight anymore.
Tara: You don't wanna fight, you don't fight. You don't use magic to make a fight disappear.
Willow: I just wanted to make things better..Better for us.
Tara: But you don't get to decide what is better for us Will we're in a *relationship* we are supposed to decide together.
Willow: Okay I realise that, I did it wrong.
Tara: You did it the way you're doing everything. When things get rough you, you don't even consider the options you just, you just do a spell. It's not good for you Willow, and it's not what magic is for.
(Season Six, 'Tabula Rasa')
...phew that was a long one, but I just couldn't decide where to stop