I trust my boyfriend but I still worry, is this normal?

Yesterday he said he would have a meeting at work after working hours so he would eat with his workmates and he came home around 8.30 pm. I trust him, but for a moment I wondered if he was cheating on me. when he came home I asked him how was the other girlfriend he laughed and talked about the meeting but I don't know why these things come to my mind when I trust him.

I trust my boyfriend but I still worry, is this normal?
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