Stucken in mission, please help me !

Yeah, I know what you're talking about. The guy's name is La'Vertius. Hell, I still have the screenshots.

Your problem is at the choices: 3 choices. Unfortunately I don't remember the other two choices but I do remember the suicidal bomb one (you picked that one?! o_O). Note: if you have the Intuition perk, you get a fourth choice. I always pick that one.

Since I never picked the bomb-on-fighters choice (Che suggested this, right?), I can't tell you what to do. However, look at the mission log. What is the goal listed there?

Edit: Basically, you have 3 problems. 1 is the real traitor who sold you out and let the pirates know about the shipment, 2 is defending the station, and 3 is taking out the attackers. I think since in your choice you haven't unveiled the traitor, the bastard is causing your gameover. You need to spare someone to watch the other ships supposedly escorting the convoy. I suspect he is doing something while you were busy attacking the enemy.