Draco
Okay, first, Susan wants you here. She didn't ask me to marry her. She asked you. You're the person she wants to spend her life with. She doesn't do things by mistake, Draco. She wants to marry you. She wants to spend her life with you. She's upset, yes, but I think it's the stress of the baby and the Rebels and you being hurt. But you going away won't fix that. You going away will make her worry more, and make her upset because she misses you and because you belong here with us. More than anywhere else, you belong here with us.
Second, I need you here. You're... you're my best friend and my love and I can't do this without you. It's hard being in a relationship with three people, but I love you, and Susan loves you... and if you weren't here you wouldn't make things better by not being here.