I think once she saw how Clayton really lives, she got the ick.
You’ve been dating for 2+ years, suddenly when she lands, no sex in a month since she’s got there? Something seems very off about that. It’s even weirder that she acts like it’s not a big deal?
To make things worse, she mentions that she can “find another boyfriend”??
She doesn’t seem motivated into this relationship anymore.
She could have started a slew of medication that lowers sex drive. There’s an interesting study about changing, adding or removing use of birth control pills can alter attraction to a partner.