I fell for my friends with benefits but he has a girlfriend, what should I do?

Anonymous
I think I fell for him, hard. We've been friends for 4 years and been friends with benefits for 5 months. Within 3 months of seeing each other I found out he had a girlfriend. I talked to him about it and he said that he's unhappy and always feels tired around her and has thought of breaking up with her for a while. I got to know her over the last 2 months (whenever we happen to 'bump' into each other) and I can honestly understand how he feels. And I learned a little about her and I think the main reason while he hasn't broken up with her is out of fear. She seems like she'll have some kind of 'breakdown' if he were to break it off with her.
Should I talk to him again and ask if he wants a relationship with me
should I stay with him until he breaks up with her
stop seeing him until he breaks up with her
or just stop seeing him completely but still friends (even if he does break up with her)
Select gender and age to cast your vote:
Updates
+1 y
I'll like to add (whether this changes your mind or not) that our friends (they don't know about us) knew his girlfriend before I did (they been together for 6 YEARS) and had talked to him about breaking up with her FOR YEARS cause she's not good for him mentally and emotionally. Which lead me to doing this poll of 'Should I'
Updates
+1 y
I'll add this too cause I talked about it and best you understand a little more so I don't have to repeat. So, I heard from our friends that (we guess) he tried to break up with her at his house around last year and he ended up calling the ambulance - but he wouldn't say why so we took a guess and this sounded the most likely reason. He was depressed around that time and told us it was because of her (I wasn't there the day they encouraged him to break it off with her)
I fell for my friends with benefits but he has a girlfriend, what should I do?
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