What should I do I just found out my fiancé messaged a girl a year ago?

I just found out my fiancé replied to a girl’s Instagram question a year ago with “I’ll cuddle you.😌” I’m not sure what the question was it does not say and he supposedly can’t remember. At that time we were together for 2 years already with a child. I’m currently pregnant we live together and I don’t know if I should call it quits.

What should I do I just found out my fiancé messaged a girl a year ago?
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