Is it weird my significant other got upset about me playing with other peoples kids especially with us not having any?

We had a house warming the other weekend and some of our friends brought their kids. Most of the kids were around 3 years old. Later in the evening when everyone had left my boyfriend says I really didn’t like seeing you with another man’s kids today. I’m confused by the comment when we don’t even have kids.
Is it weird my significant other got upset about me playing with other peoples kids especially with us not having any?
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