Would she cheat?

Alright so... Maybe I'm just completely overthinking this and it's me being dumb but anyways... Me and a girl have known each other from work for about 7 months roughly. She is in a relationship coming up 2 years with another guy...

We've met up for lunch recently outside of work and another time before Christmas went to a work party at a bar... We always talked on Snapchat but recently we started actually texting.

Is is possible she has gained feelings for me even though she's already in a relationship and has said previously that "he is the one" (Keeping in mind they are 20)

Would she cheat?
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