Boyd's Twitter account retweeted a Texas A&M fan's tweet, which stated, "Whenever ya'll are ready to transfer... We're ready" as the Longhorns were trailing TCU 37-0 at halftime.
In a statement released by the school on Sunday, Boyd apologized and tried to affirm his loyalty to Texas.
"I extend my sincerest apology to all of the Longhorn fans and family and everyone at UT," Boyd said in the release. "In no way did I intend to be disrespectful or disloyal. That I am 100 percent committed to this team and program."
Boyd also said he personally apologized to his coaches and teammates.
Texas coach Charlie Strong made clear after the game that players' use of phones during games is prohibited by the team.
"They should never be on their phone at halftime," Strong said.
A true freshman cornerback from Gilmer, Texas, Boyd was listed as having played against TCU, but he did not record a stat. Boyd has recorded 13 tackles in five games as a Longhorn.
The tweet has since been deleted, and there have been no further tweets from that account since the incident.