Should I say / Do something about my friends relationship?

Anonymous
So there's a couple in my work, We are all friends but they have been in relationship for 3 years, They have been living together, Unknown if it's been for the full 3 years but at the same time are only teenagers (19)... The relationship seems to be very toxic.

They are constantly arguing with each other and last week both considered breaking up as it's that bad as the guy had left the girl in almost tears. She told me last week that he had grabbed her arm forcefully and it hurt her, Every day there is new drama with the guy starting an argument over the smallest things...

I don't want to be the person to break them up or say something that could make it potentially worse but I don't want to see either of them getting hurt physically or mentally...
Should I say / Do something about my friends relationship?
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