Thank you all for your messages of support. I know I've made the right decision, I just wish I didn't have to.
Mali will keep me pretty occupied for now

Just like to pass on my message of support too - it is a very hard thing to do, but I am sure the breeder understood your predicament and at the end of the day, like you would want you to have the time to enjoy the pup.
Hope all goes well with Mum, and in time you find it possible to have your new pup.