I'd recommend 'Eternal Devotion.' Here, the hero is completely fixated on the heroine, and his actions are driven by this obsession. It's a story filled with intense emotions and drama.
It could be because of her unique personality or charm that catches his attention and makes him unable to resist.
In 'obsessed hero romance novels', the hero often has an intense focus on the heroine. He might be constantly thinking about her, like in 'Twilight' where Edward is always aware of Bella's whereabouts and her safety. His actions are mainly centered around her.
You might want to check out 'Fated Entanglement'. Here, the hero, due to his powerful position and stubborn nature, forces the heroine. This causes a series of conflicts and challenges for both characters as they navigate through their relationship.
A good example is 'Me Before You'. Will Traynor becomes rather obsessed with Louisa Clark in his own way. His feelings grow deeper as they spend time together. And 'The Notebook' is also a great one. Noah is so obsessed with Allie that he spends years pining for her and trying to win her back. His love for her is all - consuming throughout the story.
Well, it could either strengthen their bond or cause problems. If the obsession is healthy, it might lead to a deep and committed relationship. But if it's too extreme, it could lead to possessiveness and trust issues.
There's 'Fading Hearts' where the heroine leaves the hero after facing constant misunderstandings and a lack of trust between them.
One such novel could be 'The Enemy Within' where the initial hostility between the leads gradually transforms into love.
One such novel could be 'The Fiery Love Struggle'. In this book, the hero and heroine have intense conflicts due to their stubborn personalities and different life goals.
One such novel could be 'Dark Desires' where the heroine is initially terrified of the brooding and mysterious hero due to his dangerous reputation.
One such novel could be 'The Knight's Embrace'. In this story, the brave knight saves the damsel in distress multiple times, adding lots of exciting moments.