<human>: So I met this guy more or less a month ago and so far it's going well, we both really like each other. You know, the usual. But he recently told me his "ex" girlfriend moved back to California at the end of December. I thought, okay, well no problem. 

The thing is, which is why I put "ex" in quotes, he still has pictures of him and her on facebook together and he still talks to her on facebook and Whatsapp. I don't have a problem with them being 'friends' but I think they're still maintaining something, and he hasn't told her he's moved on.

I want to ask him to delete those photos of him and her and tell her it's finished, but I have a feeling he will refuse. I don't want to seem like a bitch or be nasty either, though I think some girls would tell him to delete her completely and cut all contact. I'm not advocating that, I know he's probably very fond of her, but I'm not sure what to do. I have a feeling he will try and maintain something behind my back if they stay friends on social media. But actually I haven't even asked him yet, so I don't know the outcome.

Summarize the given text in a few sentences.
<bot>: My bf's "ex" gf moved back to California because her visa had expired, he hasn't told her it's finished and still has pictures of her, not sure what to do regarding him speaking to her still.