Is he giving me the silent treatment because I wouldn’t talk to him?

Anonymous
I found a message from another woman on my boyfriends phone. I confronted him about it. He wasn’t mad he just kids of laughed it off. Then said they are just friends. They went on a few dates awhile back. She told him she didn’t want a relationship and they both decided to be just friends. He said he only sees her once in a while to have dinner. My problem is he never told me. He thinks it’s no big deal because he’s not sleeping with her. Though at first I just gave him the silent treatment and wouldn’t tell him what was wrong. He said his ex wife use to do that and it made him mad. Now he’s no longer texting me. I messaged him Saturday and he replied. Though haven’t heard from him since.
Is he giving me the silent treatment because I wouldn’t talk to him?
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