TMZ just spoke with Roger Huerta -- the former UFC fighter involved in a bloody street fight in Texas this weekend -- who tells us he only got violent ... after the other guy swung at him.
In a phone conversation just moments ago, Huerta told us he tried to remain calm early Saturday morning when he watched some random "huge guy" punch a girl in the head in the middle of the street ... explaining, “I just don’t think that it's right to hit a woman. Period.”
Huerta tells us, "I approached the man calmly and said, “Do you know what you just did? You just knocked out this girl."
But Huerta claims the other guy responded, "F*ck you, f*ck these bitches, I'll knock out any f*ckin' bitch that I wanna f*ckin' knock out, I’ll knock your f*cking bitch ass out.”
Huerta added, "... and as he's saying this, he's taking off his shirt ... and at that point I was like, alright.'"
Huerta insists that he didn't throw the first punch -- and only reacted when the other guy "started swinging at me" ... and we all know what happened next.
"I got the better of him and I left," Huerta said.
The 27-year-old explained, "If that was my mom, if that was my sister, my spouse, anyone … I would’ve wanted someone to step in and do something about it.”