Ex Girlfriends Former Best friend messaging me on snapchat?

Gonna try to make this short. My ex and I broke up 7YRs ago and her best friend and I are still friends on snapchat. All 3 of us would do everything together, Even worked at the same resturant. We took a trip to Keywest back when I was dating my ex. Fast forward, she now lives in FL with her new boyfriend and Im happy for her, She has a completely new life. My ex and I are currently NO CONTACT AND her best friend dont follow each other on socials anymore. (I have no idea what happned between them). I've been on vacation for the past 2 days in KW and my ex's former best friend now starts messaging me and remininencing about the things we did and places we went since she's been viewing my stories. WHY whould she all of a sudden start trying to "Reminence" its been 7 years. She also now has a boyfriend too? I just thought the contact out of know where was so subtile and strange. She messaged me first yesterday and the convo was pretty short (small talk). I left her on read yesterday and, TODAY she messages me again saying "OMG you went back there too?" whats this motive of hers? Like I said They DON'T follow each other on socials so I don't think there's any communication but, I don't know

Ex Girlfriends Former Best friend messaging me on snapchat?
Post Opinion