No that's a solid point. I mean he could believe Faith too but if he's got her phone in his hand and is saying, "look, these are the actual messages" than I'd say that's pretty credible. Like if Elric is looking at that shit on camera or something, which who knows maybe he is? (Probably be good to mention that).
That doesn't mean Faith isn't withholding something. I'm thinking about manipulative shit a retarded teenager could say. She could have very well hinted at shit like a threesome or something, she could have agreed to something verbally then lied about agreeing to it. That wouldn't work on a normal functioning person, but it would sure as fuck work on someone getting black out drunk who probably doesn't quite remember conversations he's had. I guess what I'm thinking is there's more to this, and it's probably really weird.