Need advice oh no 🤦🏼‍♀️

Okay so one of my friends has been really flirty with me recently and he’s been texting me but I didn’t think it meant anything because ive heard he’s been texting other girls like that too. So I accidentally sent him a Snapchat of me talking about my ex and he seemed to get upset about it and started sending me black screens and being really blunt. He kept on denying something was wrong but I’m not stupid. What does this mean and WTF DO I MDO !