Relationship advice: received a warning about the girl I’m seeing…?

The warning was a message from an anonymous number saying:

She started dating a guy while she was separated from her ex-husband

——

she admit this is true and she regrets it

I have strong feelings for this girl but I feel these are big issues and they concern me especially worried about loyalty. How should I go forward?

should this be a dealbreaker?

Relationship advice: received a warning about the girl I’m seeing…?
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