My partner never leaves my side?

I declare I’m going on a trip with a couple of co-workers. It’s a day trip and it’s to do with work but it’s also fun. My partner asks can I come, I say no it’s work people only (he sits awkwardly when around my people). He sulks then for a good hour 🙄 i can’t go anywhere without him, even to the local shop what should I do?
My partner never leaves my side?
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