>Actually I didn't met her a month ago, we dated serious one month ago. We met each other on a period of two months, still little.

One month, two months, that doesn't change a thing I said.

>She already knew this guy and said that when we started dating she stopped talking to him, still hard to believe though.

This extra info is also irrelevant in regards to my advice.

> I think you are right.

That's all you really needed to say.