The Girl Next Door by Jennifer Hanks

After a disastrous marriage and an even worse divorce, Colin Campbell is looking forward to a fresh start with his son in their new home, and the calm that will bring to his life.
The quiet life he’s been craving is well within his reach.
Until he meets his new neighbor.
Millie Solanski.
Uninhibited.
Outspoken.
And maybe even a little crazy.
Somehow, he finds himself involved in her world and the ridiculous situations she seems to constantly find herself in, squashing any hope for the life he wants.
Or at least the life he thought he wanted.
Before he met the girl next door.