So at first you're fed up with her and don't care about her. But when she wants to break up, you try your best to get her back? What's with this hot-and-cold behaviour?

Sounds like she's giving you a taste of some hot-and-cold behaviour of her own.

I don't think even she knows what she really wants. I think you should rather think about whether anything she says can be trusted.

If I were you, I wouldn't even believe her if she told me the sky is blue.

You mean why don't I believe her?

Because she keeps changing her mind.

That is a pretty good reason to disbelieve someone.

Why do you want to keep going after a girl whose word you can't trust?

You really don't have a sense of humour, do you?

I dun belif her.