what am i gonna say or do?

second edition (shorter version)

there has been this man i was involved with in the past that had some stalking tendencies to him, now and then couple of years in between i have noticed this pattern with him as if he knows or will get to know people in my surrounding. this was something he was up to before we got involved. I could categorize these people like this:

-people who he is manipulating but they do not know it and think they mean well

-people who play along and think they are clever and in the same bunch as he is in then, these are the "reporters" or "watchers", they will report back to him what they have seen.

I have now come to think there is a reporter/watcher in my surrounding. Before i would cut off all contact. never say anything that i know or suspected this is so and so connected to him.

should i call this person upon it? can also be that this person do not know it but by the way this person is acting (and I've been around before so I know by now) I think it knows.

Would me confronting this person (but in a polite way) make this person in my past to back off or will it trigger?