<human>: Can you provide a brief overview of the text?

Me - 26 m, her - 26 f.

We've been together only a month but we're really into each other, we have great chemistry and we both want something long term because we're very happy with each other. (So many "we", I wish I knew better English so I could rephrase).

Anywho, she told me that she was with a guy for a year and a bit and that she loved him but he did not love her back and he left her when he moved with work to a different country.

She keeps mentioning him randomly, showed me pictures of him without me asking, told me about stuff they used to do together, again, without me asking. I had a gut feeling she's still in love with him but did not say anything.

Today I saw that in her IM, this ex-boyfriend is in the "Recent Contacts", checked the history and I saw they've been chatting regularly for months. I did not confront her about it yet but I don't know how to approach it. She will of course say she has no feelings for him but can it be true? Why would anyone keep contact with an ex if they have no feelings for them anymore? I hate this situation and am seriously considering ending the relationship before I get seriously hurt.
<bot>: I had a gut feeling girlfriend of 1 month is still in love with her ex, I saw today they keep contact via IM. Don't know how to react but I am fairly certain she's still in love with him.