my iPhone 10 wont pair with my Mac pro keeps dropping in and out

That is correct. You can’t pair an iOS device with any other iOS device or Mac using Bluetooth, except for using the phone’s personal hotspot. But you also don’t need to. There are several ways of transferring content between devices that don’t require the devices to be Bluetooth-paired. You can use AirDrop, iCloud, Handoff, Continuity, copy/paste between devices and other various sharing options.

An iPhone will not pair via Bluetooth to a computer (Mac or Windows) or an iPad except for personal hotspot and then only if your cellular plan supports it. See the following for more information: https://discussions.apple.com/docs/DOC-7722

If you are attempting to use Handoff/Continuity or AirDrop, that does involve Bluetooth but the devices are NOT paired; Bluetooth just needs to be on and the devices in range of each other. The following may help with Handoff/Continuity issues: https://support.apple.com/en-us/HT204681

Also see https://support.apple.com/guide/mac-help/share-files-mac-bluetooth-devices-mchle7fa9e15/10.15/mac/10.15

Your support tip is still getting some use!

That tip is 6 years old; I forgot about it! I’ll try to remember next time.