My husband wants to meet up with another woman but won’t because he thinks I’ll be mad?

He works on a project with a woman from work after work, mainly online, and everyday. Today, he told me he wants to meet up with her to hang out but told me he thinks I’ll be mad so he won’t.
Should I tell him it’s ok to go or is it a red flag that he asked?

My husband wants to meet up with another woman but won’t because he thinks I’ll be mad?
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