My girlfriend (18 F) and I (17 M) have been dating for close to a year now. With prom coming up soon, we sat down to talk about our plans. Well, at work the other day, the subject of prom came up at work too. I started to talk to my friend (20 F) about it. It turns out that she never got to go to her prom because she was in the hospital. 

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Well, this friend is pretty important to me. When I started my job almost a year and a half ago, I lacked almost any social skills. This friend was the first person to really talk to me and treat me like a friend. She helped me through one of the most trying times of my life, as I also had severe social anxiety prior to starting this job. While my friend probably doesn't know this, my progress to having the social skills I do now is largely in part to her. I see this as an opportunity to give back to her for helping me.

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My girlfriend is opposed to me wanting to take her with us because she says that this should be our special night, and she wants me to herself. I hold the position that I want to take her due to the aforementioned reasons. So what do you guys think? AITA?