Is AUTHOR wrong in the post ? POST : Earlier this week, my roommate and I were talking about Valentine's Day plans. I asked if he was going to stay with his girlfriend (who also lives on campus)? He said he would, but he didn't seem super excited because her roommate was going to be there and he doesn't really like being around her. I asked because I wanted to know if my girlfriend, who lives 45 minutes away, could stay the night with me and we could have some alone time. He knew that was my motivation for asking and probably why he agreed. 

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Come Valentine's Day, he tells me he's probably going to stay in the dorm. Apparently his gf's roommate had plans to go out and not be in the dorm, but her plans fell through so he wanted to stay in our dorm, possible with his girlfriend. I got upset because it messed up my plans and I felt like he could've done more to spare my plans. He got upset and said I was being ungrateful because he made plans for me and then I got upset cause they didn't work out. 

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I know he's got a right to the room and I'm not upset that he wanted to stay there. I was upset that he said he'd do one thing and then changed it. It's not like he hasn't stayed the night with his gf and her roommate before. He's not required to protect my plans but I feel like he it wouldn't have been that big of a deal for him to stay with them any way so both of our plans wouldn't get messed up. So AITA?