<human>: Can you condense the text into three sentences or less?

Relationship of 6 months. Boyfriend/Girlfriend

So these past couple of days my girlfriend has kept bringing up one thing over our phone conversations and last night it escalated into something bigger.

So 6 months ago, when our school was having prom, I was getting ready to ask her to prom but we were just friends before prom and not really in a relationship. During that time, her friends suggested that I buy her flowers and a bear and during that time, I said that since we weren't in a relationship yet, I didn't want to purchase her like a 30 dollar bear when I had already gotten her 40 dollar flowers. I felt like that it was enough and I wanted to ask her how I wanted to ask her and not how her friends wanted me to ask her. I just simply told her friends that I didn't want to make such a big effort just to ask her to prom. ( I paid for everything at prom, tickets and limo and photos)

Fast forward to now, my girlfriend says that she is extremely bothered that I didn't get her the bear and the fact that I said that it wasn't "worth the effort". Since this happened 6 months ago, there is nothing I could have done but at the same time, I don't see why I should have gotten her a bear? The way she puts it is as if I didn't like her enough to make an effort to ask her to prom. I don't see prom as such a big deal yet she does and she wanted to stay angry at me over such an insignificant thing that happened 6 months ago. 

I don't know how to respond to this and hope reddit can help me out here.
<bot>: I didn't buy my girlfriend a bear that her friends wanted me to get her when I asked her to prom, now she wants me to feel bad about it because I didn't "make an effort".