Why are you husbands so insecure about your wives?

Walking back to the office from lunch break yesterday.
I hear some girl yelling my name.
It's a girl that was my neighbor when I was a teenager that I haven't seen in 10 years.
She runs up squealing omg it's been forever and gives me a hug.
I said "Hey, we should grab a coffee or bite to eat some time".
She replies "I would like to but I don't think my husband would approve. He wouldn't want me to be alone with another guy"
I said "ok, whatever, take care".

This is a girl I never dated.
I had girlfriends while we were neighbors and she had boyfriends.
There was a mutual attraction growing up, but we never even dated.

Why are husbands so weird about this kind of stuff?

EDIT: Clarification since people seem to be confused.

As I said , when she chased me down I was heading back to the office.
I didn't have time to chit chat.
Since she works near my office I thought that instead of saying " hey, nice to see you, running late, bye" that I would be cordial and say "hey, let's grab a coffee or lunch sometime" since she worked across the street.

Geesh, you fellas don't have much confidence that you're able to please your woman if you're that terrified of her having lunch or coffee with an old childhood friend.

I would hate to go through life so pathetic and insecure.