James- he was pissed. The fact that it was right after the Gryfinndors had won and was a giant gesture really got to him. He clearly wasn't over you because after the game in the changing rooms he asked if you had really said yes. You told him to shove off simce you hadn't spoken in months (besides in quidditch) and now that someone else asks you out he decides to talk to you
Sirius: he didn't care. He was already on his sixth or seventh girlfriend since you had broken up. It had only been like two months.
Remus- what ex? Remus is your first boyfriend ever.