Was he wrong to make fun of her old appearance?

“My girlfriend invited me to her parent’s house over the weekend and showed me an old photo album. I told her that she had a major ‘glow up’ and that I wouldn’t have dated her in high school if she looked like that.
I thought it was a compliment, but she became so upset that she hasn’t replied to any of my messages for two days.
Was it really that bad to say that, or is she getting offended over nothing?”