I need objective opinions because I'm trying to determine whether I'm overthinking this or whether my concern is reasonable.

Recently, an unknown person contacted my condo agent regarding my planned move. The person appeared to know that I was planning to move to a specific area of the city, information that I had only shared with a very LIMITED number of people.

The person also appeared to be using a profile photo associated with my private LINE app account, which is not something I publicly share on social media.

What concerns me most is that the person provided false information to my agent, specifically suggesting that I had already started moving my belongings out. This was untrue. I had not moved anything yet. His message sounded like with malicious intent making it sound like I was escaping. 

As a result, my agent became concerned and contacted other people to ask about my whereabouts.

For context:

I had already informed my condo owner and agent about my departure approximately one month earlier.

There was no dispute regarding my tenancy.

I do not know the identity of the sender.

I do not want to accuse anyone without evidence.

My questions are:

Based on these facts alone, would you consider this suspicious or could there be innocent explanations?

What are the most likely ways someone could know: 

my planned relocation area,

my private LINE profile,

and my condo agent's contact information?

\- My hunch is among my friends, down to 2 suspects, but it's hard to guess who. 

Are there reasonable steps I can take to preserve evidence and investigate further without violating anyone's privacy or making false accusations?

I'm specifically looking for objective analysis, not speculation or suggestions to harass anyone.

I would love to send the screenshot of the convo sent by my condo agent to identify his photo, too. 

Help on how I can identify the person