But a “mature” answer would be if she’s a solid woman, there were no previous problems prior to her telling me that, as well as if we’ve been together for a long time.There are men who are married to former Train passengers.
No woman would ever disclose that to a man she wants to take her seriously.
Her closest female friends would know, but never her husband/s.o.
There would be no reason for her to tell him.
Females will never admit to a train being ran on them especially to a guy they actually want to be with

This is why you need to know everything about that person before considering having a relationship or wifing up.