I am writing a romantasy novel and I’m starting out with a love interest who was a previous ex. In the end, he will betray her, however I need some character flaws that leaves characters feeling uneasy about him. Any tips?

Read also:

• Major supermarket chain workers start strike across 4 cities - TheStreet
• "The AI Told Him To Kill Himself And He Did": 10 Nightmare Things AI And Robots Have Done To Humans - Yahoo
• Seven replies to the viral Apple reasoning paper and why they fall short - Hacker News
• Isn't it ironic people always talk about how much women hate Donald Trump, when almost any of them would marry him if they could? What he said in the 2005 Billy Bush video, almost every woman would share the sentiment if it got them his lifestyle.
• Mexico prez calls for no ICE action at Gold Cup - ESPN
• 'It's such a dream': Top high school performers step out on Broadway - NPR
• Nintendo Switch 2 sets all-time launch record for hardware in the US, beating PS4 - Video Games Chronicle
• Ryan Blaney hits right notes in Nashville, lands first Cup Series win of season - NASCAR.com
• Why did my 2001 4.6 liter Mustang GT V8 make "only" 260 HP while today's base Dodge 3.6 liter V6 churns out almost 300 HP? Both benefit from fuel injection and ECUs.
• Navigating some of the thorny questions of estate planning - NPR
• Can I add pencil on top of my dry brush oil painting? Reason being it's easier to draw darker hair colour. Will pencil lead and oil paint interact and cause something horrible?