My girlfriend looks at porn and it bothers me.

I have caught my girlfriend looking at porn a while ago, and I had a talk with her about it. I told her it bothers me. She said she would stop looking for me, but now I am curious once and a while and I look at her browsing history. When I went out of town for a week last month, I seen that she had being going at it again. While I can understand she is lonely and stuff, why does she do it otherwise? There is some history that she was watching videos recently and it bothers me.

Am I being too sensitive about this? I do look at at porn occasionally, but I don't get off on it. I know she uses it to get off.
My girlfriend looks at porn and it bothers me.
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