Warzone Req Bundle

Okay, so I got the Limited Edition of Halo 5, and it came with the bundle… Well I gave it to my boyfriend (both love halo) and we were thinking its split screen, (since every other one was), so we just put it on his account. When we found out it wasn’t split screen, (after he finished campaign.) So, I started playing by myself so we can play when he gets an Xbox one. So, I was going to buy the bundle with my Xbox money or whatever and it says I already purchased it. I didn’t put it on my account, it was on his. So, I tried everything restarted my Xbox, took the game out, everything. Nothing, still saying it. I am not buying the game again, I am not getting another one. I just wanted to get money for it and buy it on my account. Won’t let me.