Why are my ex's friends adding me on Facebook?

Firstly, I don't want him back. I realized he treated me badly and were not friends. I hated his new group of snobbish friends. Anyway, I got Facebook to keep in touch with old friends and suddenly, I get a friend request from one of his friends. He's well aware me and my ex rarely speak despite him texting me and joking about hooking up etc. (which I ignore) and he knows where not friends and that he's already got another girlfriend whom he sees as a fling and she adores him. Then, another one of his friends I've never met adds me (recognize him by his photo and name). I've only recently got Facebook and my ex is away on holiday so hasn't had chance to use it since I've joined.

So, think there's a reason they're adding me?

I know they're may not be at all and I'm just curious really. Thanks x
Why are my ex's friends adding me on Facebook?
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