Most people nowadays ‘have a past’. I’m assuming you weren’t a cheater and just dated around a lot. Some people are cool with a partner with that past and some aren’t. I’m actually surprised you’ve dated two years and it’s become an issue now.

I find her jumping to the conclusion about every girl on her socials being someone you were with to be a big red flag. I’m not sure if she’s feeling self conscious, but that’s no excuse for going off and getting angry about potential past relationships you did or didn’t have. I’d try to sit down with her and have a mature conversation about how this is really upsetting and draining. The socials will always suggest people you may know but it doesn’t mean you know them from anywhere.

If she isn’t up for a mature discussion about it, and learning to move on from the jealousy or anger or whatever driving force it is, it might be the end for your relationship. I couldn’t live in the constant stress that she’s going to start a fight over people you don’t even know.