Derek Carr is expressing remorse over the Henry Ruggs accident ... saying he wishes he could've done something to help prevent the crash -- questioning, "Did I not let him know that I could be there for him at 3 AM??"
The Las Vegas Raiders QB spoke with reporters Wednesday about his ex-teammate's situation ... saying, "No one ever wants to see this, whether it's a football player or not. You never wanna see something like this happen and it broke my wife and I's hearts, honestly."
Carr says he actually got a text from Ruggs hours before the tragedy .