I had to Let You Go by Emma Quinn

When Sophia got accepted into Harvard Law School, she thought it was the best day of her life. She quickly realized she was wrong.

First, her boyfriend Ethan, not ready to follow her to Boston, dumped her as soon as he got the news. Then, she learnt she was pregnant, and her life changed forever.
Seven years later, now a single mom trying her best to raise her son Luca, Sophia has become one of the best lawyers in the country.
But when she gets offered the opportunity of a lifetime, working with the best and sexiest actor in Hollywood, Sophia has to make a difficult choice.
Seven years after his mother died from cancer, Ethan’s life is a wreck. Yeah, he’s the best paid actor in Hollywood, living a life of endless parties, dating sexy models, driving fast cars… But he’s not happy. Not since he lost the love of his life. Not since he lost Sophia.
So, when Sophia suddenly turns up at his house, saying she’s his new lawyer, Ethan knows this is fate. He won’t let her go this time.
But there is one problem: Sophia hates him.
Clearly, she’s moved on. She even got a child of her own now. A child that looks just like him…
Can Sophia keep any longer from Ethan the truth about his son Luca? Will she be able to forgive what he’s done to her many years ago?