Why do you think my girlfriend left me for my best friend?

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My girlfriend and I had been together for a few months. We had a few arguments because she and my mom weren't on the best terms. I had introduced her to all my friends and I found out that as things got worse with my mom, she would commiserate with my best friend. While I was on a business trip, she and my so-called ‘best friend’ got closer and closer and eventually she left me for him. And the worst part is that I still love her. Do you think I should feel guilty? Which one should I be more angry with?

Why do you think my girlfriend left me for my best friend?
Why do you think my girlfriend left me for my best friend?
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