Maybe Forever - an IR romance about second chances by Kim Golden

What happens when the honeymoon's over and real life begins?
Four years and two children into their marriage, Laney and Mads are not the couple they used to be. Laney's struggling to deal with motherhood and a case of baby blues, while Mads is so focused on making a success of his furniture design business that he's lost sight of promises he's made--to himself and to Laney. But when Laney's had enough and leaves him, he needs to decide if he's ready to accept a life without her...or if they can find a way to have the forever they always wanted.

Maybe Forever is book 3 in the Maybe... series, but can be read as a standalone novel.