r/Catan: Help knowing if my girlfriend is lying/cheating on me

I always like strategy games but I never got my hand on catan, this is a weird first approach, but oh well, what can I do.

To not make it too long, my gf recently went on a trip with some friends, there she met a guy who was a friend of a friend and was there. Let's say some weird shit happened with him. After that we broke up. She apologize, swear to change, blah blah. Now we came back together. In this trip with this friend group she started playing Catan.

Today she went to her best friend's house (hereinafter gay friend) part of this friend group. Of course I have no problem with this. In theroy there was only the two of them, but I asked her recently and apparently her other best friend (female, again no problem here) joined as well who as well was in the trip.

Gay friend uploaded to his ig story the next pic:

Now, according to google each color represents a player.. so there aren't really three people there, no?

Tl;dr: I need to know how many people my gf is playing with to know if she is cheating/lying on me