Am I in the wrong?

A good friend of mine has developed a crush. All she ever does is talk about him. She acts different when he's around (not in a good way). So this has been going on for months. So just today, she tells me she has a date with him. I told her "good for you" (not sarcastically or anything). And she said "oh I thought you'd be happier", and stormed off. It's not the fact that I'm not happy for her, I've just grown tired of her constantly talking about him.