Am I wrong for how I feel?

My fiancé and I are going to visit her and her ex’s dog that they share jointly, her ex will not be present during the visit because she’s known to not be cordial. My fiancée and I were talking about taking the trip down there and she proceeded to tell me that her ex has covid. I asked her how she found this out and she said she looked up her ex’s profile on Facebook to “check up” on her. I felt a bit put off by it and don’t know if I should be? Why does she need to check up on her?? How would you guys handle this situation?