Hi Gabbie,
Your bf is offering you a very nice gift, he deserves a hug.
I'm an old fart and so I'm going to offer an old fart suggestion.
Go to a store and ask the counter guy to get one of each out for you to see how they feel. The D700 is a bit larger than the D7000 so check to see if it feels right to you. Will it be too heavy? Can you reach the important buttons comfortably?... Play with both of them a bit.
The D700 is a really good camera that will still be a really good camera in 7 or 10 years. The D700 has a full sized 35mm format sensor while the D7000 does not. A lot a photographers, me among them, learned small format photography using 35mm (135 format) slr cameras. The advent of the D700 gave us an affordable digital camera with an image format we learned on. I did use crop sensor cameras (D100, D70, D200) and got used to the limits of the format but I much prefer the images I manage to create with my 'full frame' D700.
Here is my old fart advice: Get the D700 and one lens, a 50mm prime is a good choice. Learn to take photographs. Leave the other lenses on the store shelf until you know what you want in a lens and that will be suitable for the images you then want to create. A bag full of zooms starting out is not the best way to go, in my opinion anyway. Get a good body, one decent lens, a decent polarizing filter, a decent flash and a decent tripod. Learn the craft, don't worry, it's not very complicated. Soon you'll know what lenses you'll need to up your game. You'll be able to judge price vs quality vs functionality. It's good advice to buy good lenses that will last a good long while, but not right off the bat. Don't get sucked in by a bunch of gear gurus into getting a bunch of zooms and primes of any quality, before you can decide yourself what it is you want.
Anyway, have fun deciding and give your bf a smootch.