The Sins We Hide (Iron Outlaws 1) by Scarlett Cole

Gwen The boy I once loved is now the fearless Vice President of the Iron Outlaws MC. And he hates me. Because of something that happened years ago. It's not my fault his father ended up inside for life because of that night. But that doesn't stop him holding me captive until I tell him what happened. Except I can't. Because not knowing is why I'm back here in this cesspit.

Clutch
The girl I once loved is now the enemy of my club.
Even though she's also the sister of my best friend and our club's new president.
I don't care that trouble brings her to my door looking for help. She doesn't deserve our protection. Until she tells me a secret that stands everything we know about the club on end.
Sins well hidden killed what chance of happiness we once had. But now, they're going to kill her.