Will this cause stress?

My girlfriend and I are having this long relationship thing. We talked on Skype every day.

One day, she told me this about a male colleague of hers whom she said she hates. She also told me she had an interest in him when he first came to work at her company; now she said she hates him. And she told me she's trying to avoid him.

The situation is this: Everyday, the male colleague will try to talk to her about work related stuffs, after which, he will slip in some personal matters. My girlfriend will try to answer (according to her) the work stuffs as briefly as possible, and ignores the personal stuffs. She also told me the male colleague will regale her about the time he spent abroad during his holiday. Now, for the past several days, my girlfriend has been having trouble sleeping, and concentrating.

Question: Could it be possible for her stress be due to her emotional turmoil of having a long distance relationship with me, while on the other hand, a perfectly young, handsome, monetary loaded chap is nearby, wooing her everyday?

Extra question: How do I stop this from being detrimental to me?