My boyfriend went to a bar with a female colleague after a work Christmas party and I feel upset about it?

Last night my boyfriend went to a works Christmas party. Afterwards, he went out with a female colleague that was at the party ( I don’t know who she is, or anything about her really) to a bar, this must have been at around 9pm.

This has made me feel insecure. We both agreed that having opposite sex friendships outside of during work hours is not something we’ll have.

Am I right to be concerned?

My boyfriend went to a bar with a female colleague after a work Christmas party and I feel upset about it?
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