Am I Overreacting for Refusing to Let My Wife’s “Work Husband” Come on Our Family Vacation?

My wife (34F) and I (36M) have been married for 8 years, two kids together. She recently started a new job where she’s gotten really close to one of her coworkers. She calls him her “work husband” and says it’s all jokes and office banter, nothing serious.

At first I brushed it off, but over time she started texting him outside work hours, laughing at his jokes constantly, and even FaceTiming him once when we were on a weekend trip with our kids. I finally told her it was getting weird, and she told me to stop being insecure.

Last week she asked if he could come with us on our summer vacation to the lake house. She said he has no family around and could use a break. I said absolutely not. This is our family time and I don’t want some random guy tagging along, especially someone she flirts with all day.

She got mad and said I was being controlling. Her exact words were “I’m not even allowed to have friends now?” I told her it’s not about friends, it’s about boundaries. She’s still mad and says I embarrassed her by making a big deal out of nothing.

So… am I overreacting?