I Hate When People Disappear In The Middle Of A Conversation

What's the deal with people who randomly PM you, then disappear after an exchange of a few short messages? [removed by staff] just did this to me a few hours ago. So weird.
I have no issue with being PM'ed out of the blue, happy to chat to anyone, but is this a spam thing? Am I now supposed to be wondering where she's gone? Does she want me to follow her? I'm a bit slow on all this sort of tech-thing so would appreciate some thoughts from other people / experts here!

EDIT -
I'm adding some additional text below the original post here, just because there seems to be some confusion... This is a post asking whether a specific user (mentioned above) is a BOT or spam. This is not me thinking that this user is a real person who just left a conversation. If it were I wouldn't have posted it as I realise people can and will just suddenly leave conversations.
Thanks!

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sleepyhead · 46-50, M

Personally I think there’s a big difference between “calling someone out” for something you’re upset with or annoyed about in an effort to somehow shame an SW user, and simply asking a question about potential spamming, which requires a username as a reference.
If I’ve broken any rules or ToS’s then I’ll check that out and amend, as I have no interest in breaking any of SW’s rules. And the reason I had no idea mentioning another username is breaking a rule in the first place is because so many other people do it. Go figure.

I am aware that no one is obliged to continue chatting in a message stream they initiated, but that is a comment relating to a “real person to real person” chat. If you read the whole post, I am clearly asking a question about whether this type of PMing is a computer generated thing, a BOT, spam-messaging. The point of including the username, quite clearly and obviously in this case, is therefore to see if anyone else has experienced this from said user and can confirm that it is indeed a spam/BOT thing.

Both my second and third questions in the post are assuming that the messages are spam, not a real person. I’m not saying I am wondering where this person has now gone, or that I’m thinking of following them, I am asking if this is the point of the spam messages. I am not in any way upset or annoyed, I am simply confused by it.