"Very well." Jarvan ran a hand through his hair, considering his words. "I suppose the first thing I should say is that I'm sorry. What I said during our battle... I will not lie and say I did not mean it, for I did at the time. I questioned your motives for leaving your home. I had thought that you had simply fled because you had grown disillusioned with what it had become." He leaned heavily on the door frame, his head hung. "I mistook your actions as those of a coward. It is now that I see how woefully mistaken I was."
Jarvan paused briefly, hesitating before continuing. "You probably know by now that I left Demacia once. Two years. Not a day passed by where I did not think of my home, of seeing the people I cared about. The possibility that I might not see them again. You... you left Noxus, with no one to return to, no home to look forward to. I cannot imagine what it must have taken to put yourself through that. My words were foolish, and I cannot begin to express my regret at having said them. Truly, I am sorry."
...I only have slightly more experience than you.
I have a few comrades, but becoming amicable with them was a much less...abrupt than this.
Not that that's a bad thing.