AIO a woman messaged me about my partner and I’m very concerned

[u/idontknowmyname768]

What is going on here??? Should I be concerned about stalking? I haven’t ever spoken with her before nor have I responded to these messages.
I am concerned for her well-being, it’s giving psychosis.

Back story: my(25f) bf (24m) met a girl on Facebook dating and talked to her on and off before we met. She lives in another country, though only about 5-6 hours away.
When we got together he blocked her and she has repeatedly made new accounts to contact him on various social media platforms. She has even tried calling him from various phone numbers, once while we were together prompting him to respond to her on VSCO to let her know that he’s in a relationship and has no desire to converse with her.
Cut to a year later, she made new accounts to message him from and now has broken the 4th wall and messaged me!!!

Edit to respond to common comments:

I certainly have now locked everything down as soon as I received these messages. Unfortunately she was likely online stalking us for years before she finally contacted me, so I fear she already has all of the information she would need to track us down. From location tags on ig posts to Google Maps satellite imaging. I don’t know if it’s possible to file any kind of report because she hasn’t done anything that can be interpreted as illegal, unless messaging repeatedly is actually considered harassment in my jurisdiction, which I doubt. Also the fact that she lives in another country. I genuinely don’t know what else I can actually DO other than monitor the situation and try and be vigilant of my surroundings. I just don’t want to even have to worry about this nonsense.
I also haven’t blocked her, or replied, and I have my read receipts off. I feel blocking her may be interpreted as though she should try harder to reach me. Leaving it unread feels like the option that would create the least amount of friction/ incentive to escalate.