<human>: Can you give me the gist of the text in a nutshell?

It was never anything serious. We only went on two dates and never slept together. We would text a fair bit and call each other every once in a while (even preceding the dates), but that has really cooled off lately. We barely talk anymore and I've generally lost interest.  Meanwhile, things have started heating up with another girl who I have talked to about seeing exclusively. 

However, the first girl still hasn't completely given up. I got a text from her saying that she was puzzled as to why we don't really talk anymore and why we stopped seeing each other.

I need to tell her that I'm not interested anymore. I may also need to tell her that there's someone else, just so she understands that there are boundaries and it might not be appropriate for her to text me at all anymore considering the history there.

At this point, what is the appropriate forum for communicating this? Phone call, text message, letter, in person?  And I've never been in this type of situation before, so what is the most tactful way to approach the topic?
<bot>: Went on two dates with a girl, mostly stopped talking, lost interest, got a text that shows she's still interested, need to tell her there's someone else now.