What would you do if you're girlfriend kissed a girl and said the other girl kissed her first?

Let's say you have a girlfriend and you find out that she kissed another girl but she told you that the other girl is the bad one and kissed her unexpectedly?
Breakup
Not breakup
Other
Select gender and age to cast your vote:
What would you do if you're girlfriend kissed a girl and said the other girl kissed her first?
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