Is this inappropriate for a married woman?

I (F) recently left a job 1 month ago that I had been at for 5 yrs. I was an I.T trainer and while being there I developed a few work buddies , some men. All innocent never hung out outside of work unless we grabbed a quick lunch. The other day one of my old work buddies (M) messaged me "I miss you". I wrote back that I missed him too and asked a couple questions about work. Later that day I brought it up to my husband and he thinks that the I miss you messages are inappropriate between another man who is in a relationship of his own and me a married woman. My husband doesnt want me to talk to him anymore. What do you all think?

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