The Other Brother (London Hearts, #1) by Tierney Page

The Other Brother - London Hearts Book One
All I ever wanted was a love like my parents had—something deep, irrevocable, and all-consuming. The kind of love that’s written about in stories. And I thought I found it with Lucas, my fiancé. We had it the house, the cat, and the promise of a future full of possibilities.
Until everything fell apart.
I discovered his secret. Heartbroken and betrayed, I convinced myself that I’d never find anything like what Lucas and I shared. He was my everything.
Then one night, I ran into his younger brother, James.
He’s a musician—complicated, intense, and nothing like Lucas. And yet, I can’t deny the pull I feel toward him. I’m drawn to him in ways I cannot explain. Opening my heart to someone so close to the man who shattered it feels ridiculous. But it’s undeniable, and I can’t resist. Trying to stay away only makes it worse.
I want him.
I’m falling for the one person I shouldn’t.
I’m falling for the other brother.