girl i FEEL you on this!! last year my ex had this “childhood friend” doing the same thing with the heart eyes and “miss youuu” on every single pic. turned out they weren’t even that close lmao just some girl from his gym. Honestly tho? before you spiral, maybe just ask to meet her at a family thing? if she’s actually his cousin it’ll be chill and you’ll feel dumb for worrying (been there lol). but if he gets weird about it then yeah… red flag city. I used https://viewverio.com/peekviewer/ once when i was in a similar situation and it worked fine, didn’t have to follow anyone. BUT real talk - if you’re at the point where you need to internet-stalk someone, the trust is already cracked you know? like even if she IS his cousin, you’re gonna drive yourself crazy analyzing every post. maybe screenshot some of her comments and have an actual conversation with him about boundaries? bc even if they’re related, the pet names are clearly making you uncomfortable and that matters!!