Am I wrong to be upset?

So my husband has these work colleagues that have been coming over and fixing his car with him (before the pandemic) I would say they’ve been over to our house probably 4 times now and my husband has still not introduced me to them. They mostly stay outside in our garage unless they need to use our bathroom but I don’t know why he wouldn’t at least tell them who I am. I’ve asked him why he doesn’t want to introduce me and he says it’s not important.