Police say Bridges and a friend killed 17-year-old Wylie East High School student Ivan Mejia in March over a girl.
Bridges and the other suspect lured Mejia behind Wylie East High and strangled him, investigators say.
The judge's decision on Friday came after a week of intense and emotional testimony.
Prosecutors argued Mejia's death was cold-blooded, premeditated, physical and done without remorse. They also pointed out that Bridges turned 17 just four days after the crime.
It was revealed during the hearing that Bridges told mutual friends, "I want Ivan out of the way so I can be with her. You don't understand, sometimes I want to kill him," and "It would be easier if Ivan was out of the picture. Ivan is dead to me."
The defense attorney read texts he claims Mejia sent to Bridges, saying, "I was her first for everything. I love her," "You don't know me well enough. It's better if you stay away from both of our lives," and "I'm going to hunt you down like a little pig. You better watch your back this time."
The defense told the court that Bridges responded with his own text, saying, "Don't threaten me."
Investigators testified that Bridges' alleged accomplice said Bridges believed he could get away with killing his romantic rival because he was an avid viewer of the TV drama series Dexter, which is about a serial killer who goes after criminals who slip through the court system.
Bridges has been transferred from a juvenile facility to the Collin County jail.
If convicted, he could face 40 years in prison.
The other suspect, who is 16 years old, is due in court next week where a judge will decide whether or not he, too, will be tried as an adult.