If they've been living together for two years, they have a common law relationship. If she wants to date other people, she should be separating from her current guy as Wildcat points out.
You said she is just thinking about going for coffee. I think that in itself is not bad. Everyone notices or talks to someone from time to time and feels attraction to them. That part of being human.
If she makes the next step of actually going out for coffee with the new guy, she is at the point where she has to decide whether she wants to stay in her current relationship or explore what else is out there.
Sitting in the fence like she is, I suspect - like Wildcat - that she is just leading Mr. Nice Guy on until something "better" comes along... and that is despicable behaviour.
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