I posted a question previously about making the decision to place my husband in memory care. The answer was the decision should be based on his safety and mine. The decision to make the transition is made and steps to accomplish it are taking place. Now how to tell him?
The facility may guide you in not visiting over some time, often a week. The dependency he has on you is going to need to transfer to THEM now, and to those around him. Try to cooperate in that as much as you are able.
There is really no way now to predict the day to day adjustment, nor to make it any better. I am so sorry that this point has been reached but you are wise to acknowledge it and to embrace it. Caregiving that isn't any longer possible is literally a killer; where would THAT leave him?
https://careforth.com/blog/dementia-alzheimers-or-memory-care
Best of luck to you!