Surely if he'd have just smelled them he'd have walked in and said "Oohh are you making sausage rolls?"
Op why on EARTH would you let him faff about with your pc and allow him to install all this stuff/make himself admin?
Just dump him. Whether he's spying on you or not your relationship is toxic and you have no trust in him whatsoever, if you continue living like this you'll make yourself ill.
If you don't already, set up/sign into your own one drive, save anything important to it. It might not be possible to completely factory reset the laptop if he's admin and you don't know the password, so you might need some specialist tech help with that.
If your phone is Android then back up your photos/videos to the google photos cloud, back up your contacts to your google account, back up your WhatsApp to your google drive and factory reset the phone. You might lose some bits and bobs but it's pretty much the only way of being sure you've deleted any spyware. If you've got an Apple phone then I'd download the google photos app and back up all your photos/videos. Harder to separate things like contacts because they all just back up to your iCloud, although should come back through with your Apple ID. Back up WhatsApp to your iCloud. Do not restore the phone from backup, start it as a brand new phone or you will just reinstall any hidden software.
Get rid of the Bluetooth speaker, if you haven't done already.
If you choose to stay with him (no idea why you would) do not allow him access to ANY of your tech again.