Fifty Shades Freed by E. L James.
When unworldly student Ana Steele first encountered the driven, damaged young entrepreneur Christian Grey, it sparked a sensual affair that changed both their lives irrevocably. Shocked, intrigued, and ultimately repelled by Christian's singular sexual tastes, Ana demanded a deeper commitment; determined to keep her, Christian agreed. Now, together, they have more-love, passion, intimacy, wealth, and a world of infinite possibilities. But Ana always knew that loving her Fifty Shades would not be easy and being together poses challenges neither of them ever anticipated. Ana must somehow learn to share Christian's opulent lifestyle without sacrificing her own integrity, identity, or independence; Christian must somehow overcome his compulsion to control and lay to rest the horrors that blighted his past and haunt his present. Just when it seems that together their love can conquer any obstacle, tragedy, malice and fate combine to make Ana's worst nightmares come true.
Christian and Ana's relationship is still going strong. They are now married and have to get used to a married life together. They face another problem in this book as someone is stalking and even trying to kill Christian.
In the end of this last book, everything is not perfect and Christian still has a lot of problems with himself and his past. But despite all this, him and Ana are happy together and it is a work in progress that in time will get better.
The book ends with them in their new home with a child. So you can say they got the whole package and their happily ever after.