Me [21M] with my friend [21 M] admitted to some pretty ****ed up **** involving his GF [21F]. How should I handle this?

Last weekend my friend and I, we'll call him John, were hanging out and taking a ride to grab to some food. During the car ride we began to discuss his relationship. Long story short him and his girlfriend of 4 years have been having major relationship issues. The relationship had technically been "open" for a while but she broke it off completely to get her head straight just recently.
I figured this was just normal college kid relationship turmoil but John decided to tell me some details about what was going on. He told me that twice in the past year they had been having sex when she told him she was done. John, being drunk on one occasion and sober on the other told her he wasn't done and continued for 45 minutes until he finished. By the end she was curled up in the fetal position crying. This was what caused the main turmoil in the relationship.
This shocked me because John is one of the last people I would've expected to hear this from. After thinking about it for a few days I am fully realizing how ****ed up it actually is. How would you guys handle this?

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tl;dr: Friend admitted to some very abusive sexual behavior with his GF and I don't exactly know how I should handle this. Distance myself? Maybe try to gain more info to help figure out if it's as bad as it seems?


Source.

I would distance myself from that whole situation, besides, you don't want to be involved in your friend's sex life

If she said she was done and he continued, then that's rape. If you are a friend you need to discuss this behavior with him and explain he was in the wrong. The two need to be separated, he crossed a line.

Couldn't agree more. No one needs that drama in their life.