He meets her eyes and looks at a loss, shaken in ways that are just too personal for him to feel comfortable showing anyone- and that's what makes him remember his circumstances. He puts his shoulders back and composes himself quickly; it may be a little on the nose, but good breeding does have its advantages. He's pretty sure he learned how to lie best in a suit (though smaller in size, of course) like this one.
"It's probably better if you forget it, just- ex-girlfriends, right?" Something Dev is statiscally unlikely to know about in those terms exactly, but he thinks she'll get the gist. "And marijuana? You really are artistic."