Am I overreacting?

Hey guys so my boyfriends got a new phone and needed help setting it up but I realized that the code was different when I asked him what it was he told me it was something totally different from his original code and it kinda made me feel some type of way because we have had issues in the past of him talking flirtatious to other women so am I wrong for feeling how I feel? He said he was going to change it back but I believe that’s bull he chose that code for a reason please help me understand? I was gonna do a Romantic candle dinner tonight but I must admit I am turned off

Edit:: yes we have had several different instances of him flirting with other women including a recent situation where he said she was still sexy to him that was like last week! So to me seeing the code change and the reason it changed to be the most absurd reason made me feel as if there’s more to it. My whole thing is why cheat when you can just be single.