"No, you made an agreement and then realized it was a bad idea, as people do. A breakup is not a betrayal." 

"I promised her I wouldn't leave her. And promises matter to her."

"....you still get to leave relationships that are bad for you." 

"Well, I did leave her, didn't I?"

"...yeah." 

He's very glad the oath is already sworn and Lilith can't take Leo back no matter what. 

"I want to talk to you and Marlo."

"We can all talk once we get to my house." 

Marlo blinks when he sees a new person with Sasha and Leo. "Hi." 

"Marlo, this is Sonja. Sonja, my boyfriend, Marlo." 

"Uh, Sunnydale?" Leo asks.

"Why are we talking about Buffy?"

"No reason. I think it'd be an easier conversation to have in private but if you want to have it now we can do that." 

"Yeah, I think we should talk in private. Sorry, Sonja."

Marlo's happy to walk Sonja to her bus stop and then he turns to Leo and Sasha and says "Alright, what was that about." 

"Lilith's thing is promises, I'm almost certain of it. Which means we're safe, because I swore an oath to Sasha-- also, I swore an oath to Sasha-- and neither of you have made any promises to her."

"Okay. I will continue not making promises to Lilith or indeed saying anything to Lilith or being in the same room as Lilith if I can avoid it. What was the oath?" 

"You can't break an oath, so if I swear an oath to Sasha that I belong to him, Lilith can't decide that I actually belong to her. --In theory she could still try to punish Sasha but I think her magic just punishes people who break promises to her, and there's no reasonable argument that Sasha promised not to steal things from her." Leo pauses and thinks about it. "Well, I read about this thing called the 'social contract' but I don't think Lilith pays that much attention in US History."

"If the social contract counts as a promise we're all fucked, but I'm pretty sure it doesn't." 

"If you can argue it counts, it counts, but I'm not going to bring up the argument for her and if she doesn't think of it, well." He shrugs. "Those are the rules of war."

"I love you." 

"The big question here is what we do about everyone else."

"I don't think there's any reasonable argument that I promised not to talk to Lilith's exes but if I keep doing it she's going to wind up pissed at me and I think we'd all prefer to avoid that. — I'm not saying I'm going to stop and I'm not saying I'm not, just." 

"You know how I feel." 

"Yeah. I do." 

"I don't know how he feels."