Am I Overthinking?

I’ve made friends with this guy through work and we were all supposed to go out (me, him, a few of our other colleagues). I mentioned how my partner (of 10 years) wanted to come along, and my friend started acting weird about it. He cancelled plans because of it. Now, I don’t know how to go about this. I feel like I shouldn’t be friends with people who won’t welcome my partner. Any advice/input would be appreciated.