The Wrath of Leander Welles by Ashlyn Drewek

Wrath — strong vengeful anger or indignation; retributory punishment for an offense or a crime.

They say love makes you do crazy things. In Bennett Reeve’s case that is the understatement of a century. Reunited with the love of his life, he will stop at nothing to ensure all of Leander’s dreams come true. There’s just one little problem — Dr. Lorelei Clayton. Until she’s gone, Leander will never truly be his. Having lost Leander once already, Bennett will be damned if he stands by and lets it happen again.
Exonerated from the four murders in his hometown, Leander Welles returns to Easton to pick up the pieces of his life. Before he can rest easy, there are few loose ends that need to be tied up. But as everyone knows, for every action there is a reaction and Leander unknowingly sets off a chain of events that even he cannot control. With each new death, he learns a painful lesson — when you’re the villain, there is no such thing as happily ever after.
Content warning: This book contains references to alcohol/drug use, various mental health issues, self-harm, suicide, and on-page torture. Reader discretion is advised.