It fell out of new partners purse

Are you a lesbian? I'm just trying to figure out who all could have perfume? Are you accusing your partner of cheating on you with another woman?

Your ex put it there to weird you out.

I would assume your 3 year old found it somewhere and then hid her treasure.

New girlfriend put it there to see if you will assume it’s hers
Or if you will hide it assuming it’s the woman she thinks you have over

Your partner is cheating on you.

Female cat burglar

Definitely no perfume there yesterday when I changed all the cushions over. Makes no logical sense.
I am male so no, not mine.

"There has been no other woman but her and my new partner in the house. "

Ever? Or just recently? Do you have a mother, sister, or grandmother that has ever been to the house? Things have a way of disappearing for a while and then reappearing when 3 year olds are involved. Also, are you female? Could it have been something that you had at one point?

My daughter is 3!! She doesn't own perfume obviously.

As for the cushions, I only swapped them over to Christmas ones yesterday so would have known if there was a perfume there.

Well if it was in the couch cushions maybe it was there for many months or even years.

"When she was babysitting my daughter."

Yes you do?

No daughters

Umm you have a daughter.. ?

I have a new partner but it isn't hers.
My female friend found it and left it on the side when she was babysitting my daughter. I saw it there after and texted to ask if it was hers but she said no and that she had seen it behind the cushion. There has been no other woman but her and my new partner in the house.
What the hell? How can a perfume just "appear?"
To add it also wasn't my partners so this makes zero sense and has weirded me out a bit.