AIBU - ex (split 5 months ago) had the kids for a few days while I went away, he also had our family dog (all at other woman's house with whom he had an affair)
I left him with everything kids needed but a key to the house for dog to let her in during day when she was left when he worked.
AIBU that other woman came into my house alone to get dog and went upstairs with my child to 'see' bedroom. I have since noticed that an item of my babies clothing is missing that she brought right after the split and then had sent back to me - her clothing is kept in my wardrobe. I really feel uncomfortable about this but not sure if it's just me being over sensitive. There have been a few things this other woman has done that i feel is to get my attention and to wind me up. So far it's been petty so I've ignored it but I don't like the idea now of them having a key as they often know when I'm out however ex is the only person I can rely on to have dog and Im meant to be going away over Xmas and need him to watch dog again.