Am I becoming a little to insecure?

I have a boyfriend, we have been together for 4 years, we have a son together and a few months back we took a break. Normal right? Well he's a big game freak he's always playing black ops. But he has this girl on there which he met by going to support his friend with his new band, and i dont know her obviously but i noticed that every morning when we would wake up he would text someone. i thought it was just his boss. so i didnt really pay much attention. til recently that i found out his password i decided to look at his messages and i noticed it was someone with a weird name that i have never seen in his phone. Well he texts her in the mornings to say morning and how shes doing and talk and talk. Even before bed. i dont know what to do because he says its normal to just ask how her days doing ... and i dont like it.

my opinion is that you have to talk to him about her, dont keep this thing play in your head, talk and calmy with no arguments, and show that you dont like it calmly as well to avoid problems and keep your relationship strong, good luck :)