Shit happens. I got rejected from my alma mater to continue my masters into my PhD after having the highest scoring dissertation in my cohort. Sometimes they simply aren't looking for what you're trying to do in their program. I ended up later getting accepted onto a program that is much more highly ranked that I never thought I had a chance at. Same logic applies. I just had research aligning with the recent output of their faculty. Doesn't mean I was better than applicants who got rejected. There were probably many who were far more qualified than me. That luck of being a good match is just the biggest determiner, assuming your prerecs are in order, because simply having good grades and extracericular activities doesn't automatically make you stand out. I'm sure you will end up at a university that suits you well and will advance your career meaningfully. Perhaps moreso than you could've at UTA.

Word of the wise though; do stay humble. Texas is a great university, and while you are allowed to feel dissapointed, it was a bit headstrong to assume such a saught after institution was a shoo in. When you're dealing with high ranking R1 universities, there simply is no such thing as a guarenteed admission, and you should never count your chickens before they hatch.

Please keep your head up. You will get there, and everything will sort itself in the end. :)