Why would my boyfriend ask someone else for a ride home?

I've been dating my coworker since Christmas.

Today we went out with close friends/coworkers, bowling. About 10 people out of 100+ so kinda intimate in terms of who.

Three of us, plus my friend were sitting at one table and the guy says something to my man about him needing a girlfriend. My response nonchalantly was "oh he has a girlfriend" I didn't say who and just left it at that.

Our coworker responded saying "oh, I didn't know." We were already wrapping up the night at the point, people were leaving. My partner suddenly asked this guy for a ride home. While we all nice within 5 minutes of each other He and I rode together with one other person.

Ultimately him getting a ride home for that guy didn't work and he HAD to ride home with me.

Am I wrong for being upset about his reaction and response to my statement?

We were with people we trusted. He didn't have to claim anyone in front of all our coworkers. But why be weird about the simple statement that you do in fact have a girlfriend? He's a shy guy but we were in good company.

Doghouse him or kick him to the curb?

Why would my boyfriend ask someone else for a ride home?
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