Didn’t faze me

I saw my boyfriend of a year snap chatting his ex today. They don’t have a streak or anything. I know it’s his ex for sure (just in case y’all say I need to make sure), and it didn’t faze me when I found out. I have talked to him about this in October when I caught him, the first time. I told him to stop talking to her bc it’s disrespectful to ME. He stopped or so I thought until today. The first time, I felt this pain in my chest (you know that feeling when you find something out and it hurts you emotionally) but this time I didn’t feel anything. Im most definitely bringing this up again bc it doesn’t make me feel secure at all. But I found it weird that it didn’t bother me as much 🙇🏽‍♀️ if this happened months ago I’d probably be so angry and let out a tear or two