First time ever asking relationship reddit a question hope i'm doing this right.  
So this guy that i will occasionally say hi to and talk to briefly.  Has a girlfriend of what i think to be a two year relationship.  So i have a class with his girlfriend and I've noticed she has been holding the hand of another guy.  And just doing other flirtatious stuff.

Now i don't know if i should tell her boyfriend or not.  What makes this more complicated is that they have a kid together.  I don't know if it would be right for me to tell him for the sake of the child.  

And she would probably guess it was me who told him cause i know her boyfriend and there's very few people in that class.
user
Guy has girlfriend who is flirtatious with another guy, Should i tell
assistant
First time ever asking relationship reddit a question hope i'm doing this right.  
So this guy that i will occasionally say hi to and talk to briefly.  Has a girlfriend of what i think to be a two year relationship.  So i have a class with his girlfriend and I've noticed she has been holding the hand of another guy.  And just doing other flirtatious stuff.

Now i don't know if i should tell her boyfriend or not.  What makes this more complicated is that they have a kid together.  I don't know if it would be right for me to tell him for the sake of the child.  

And she would probably guess it was me who told him cause i know her boyfriend and there's very few people in that class.
user
guy i've been talking to could be cheating on his girlfriend. Should
assistant