This is not what you are going to want to read, but without the help of the person that took that iPad, this iPad will stay Activation Locked and a dead and useless device to you, now.
No one here can help you.
If your boyfriend still has the receipt for this iPad, I suggest contacting/reaching out to Apple Product support and services. about this issue to see if they can remove the Activation Lock on this iPad
Tap on the first link below and scroll down some to get to the Apple Product Support section and phone numbers for your location/region.
https://www.apple.com/contact/
OR
https://support.apple.com/en-us/HT201232
Best of Luck to You!