Opinion on what I should do. Girlfriend problem?

Okay so my best friend( the one that I thought tried to steal my girlfriend)(see questions on my account) wanted my girlfriend to watch a outlast dlc by pewdiepie. Well she spent 20 min out of 30 min in lunch watching it with him on the other side of the table. I was just sitting there they enter time. Well right before the video ended I got on my phone to look at ifunny, well when the video ended I was still looking and she came over and turned my iPhone off and said she wanted to spend time together because she doesn't think she'll see me that much over summer. Like what the hell, spend 20 min watching a videos ignoring me with my best friend then a soon as she came over it was all about spending time with me. I ignored her and didn't say a word the next period and she asked what was wrong and I said nothing. Did I overreact or did she deserve being ignored? I'm really confused and should I have been that mad?

She might have just been trying to get along with your friend. Girls tend to think that they have to get along with their boyfriend's friends, because they feel like it's important to him. Don't ignore her, just be nice and say "I'm glad you like my friends" or something so she knows there's no hard feelings.

Don't get too mad yet. I understand that your probalbly mad but be calm atleast for now and hopefully she is just being nice to your friends