Am I over reacting?

Okay I can be a bit petty and childish at times I know. So me & my SO separated back in June and we did our own thing and then later on came to realize we were lost with out each other. Well he hooked up with this girl ( mind u she was 6 months pregnant from some other guy). well anyways he has no contact with her what so ever and neither do I. But she religiously stalks my Twitter & IG and fb. Well just lastnight she liked then unliked one of my pictures on IG so obviously the line was gone and she was just snooping around. Well I hit her page and I saw a mirror picture of her and it had a fm reflection of a lotion that she uses. A few weeks ago my SO WENT & bought that same exact lotion she uses. I kinda flipped out on him about. Was I over reacting? Lol🙈