Was I wrong for not telling my husband I had dinner with an ex on vacation?

I went on a vacation with my sisters. While vacationing, I ran into an ex. The two of us went for a dinner to catch up. We also stopped by his place after dinner to check out his new place. I didn’t know he lives in town. I never told my husband because I didn’t think it was a big deal. My big mouth sister let it out, and now my husband is not happy.

Was I wrong for not telling my husband I had dinner with an ex on vacation?
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