My Girlfriend and I have been together for two years and it's been great overall. We're both gamers but have different game preferences. She prefers single player games and I'm more into MMOs. I raid Tuesday, Wednesday and Saturday and she's been okay with it. Her mom came into town on Saturday and we saw her on Sunday. Her mom is leaving on Wednesday and she wants to see us again on Tuesday. But I raid that night so I told my gf that I couldn't go. She got upset that I seemed to be prioritizing raid but she doesn't seem to understand that a raid is important. Besides, we already saw her a few days ago! I told her that raid was more important than seeing her mom a second time. She got offended and said that I cared more about raid than her family. I feel like she was putting words in my mouth. Her mom lives across the country and we only see her twice a year but I already saw her. My girlfriend started crying and she was surprised that I didn't really care. I felt like I needed to stand up for my hobbies and my time. I just feel like she shouldn't expect me to give up previous commitments.

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AITA for standing up for my hobby? 