AITAH for dumping my girlfriend after she insulted me at the gym?

Girlfriend and I often go to the gym together. We have different routines, and usually go our separate ways, but end at similar times.

Yesterday, she complained that I was taking too long. I told her ahead of time that today was both cardio and lifting, and I would be a while. (I told her last week that today would be my quarterly 3-mile run challenge). She apparently forgot.

She told me that since I'm obese, I need to lay off the weightlifting and do more cardio. It'll save time.

I corrected her in saying that I'm 5'5, 200lbs on purpose, lift 6x a week, and can run 3 miles in 21 minutes (same as in the Marines, when I was 60lbs lighter, 5 years ago). Technically obese, I guess, but strong/feel great/have great cardio/and have a body that is bulky but not extremely bulky (if that makes sense. Pecs are further than my abdomen).

She left the gym after I told her to take an Uber. We live separately.

I was hurt by this, and was embarrassed that I cried a little in the gym. I worked hard for my fitness, and it keeps me centered. This shit hurts when it comes from someone you love. I texted her that it's over, and ignored her calls.

(http://www.autoadmit.com/thread.php?thread_id=5744330&forum_id=2Reputation#49057785)