[Always *]

I kind of agree with the others. If he is your ex, I am not quite sure why you care. If you are no longer together, of course he is entitled to move on in what ever way he deems fit.

If he has other friends or other possible reasons to want to be near by (ex. a cafe, restaurant, clients, etc.) then that might be why he was near by

He probably changed his settings because it would have made him really uncomfortable that you were challenging him on not wanting to see you. He was probably creeped out by the fact that you were following his behaviour/whereabouts on this website. It probably made it seem like you were just sitting around checking his profile all the time. Like, yes, the info is available but he was probably bothered by you following him around on it. Especially because he's your ex.

So beyond that, I am not really sure what you are looking for here. Maybe you can clarify.