So my roommate has been dating this girl for around a year now. She had to go study abroad for 6 months. That put a huge strain on their relationship. They broke up 2x while she was abroad. He tells me all his relationship problems. When they first broke up in the summer, he called me. He was very distressed and upset. I did my best to comfort him telling him that their dynamic wasn't the best and that they fought constantly and that it was no big deal. Sometimes it just doesn't work out. He ended up getting back with her less than 2 weeks later.

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His girlfriend is shy so she has trouble making friends. She was lonely when she was studying abroad. My roommate tried to fill the void but it wasn't enough for her. On many occasions, she has said hurtful things to him on why they should break up. Things like "Give me reasons why we should stay together" or "You may think we have good conversations but i don't". Everytime she comes over to see him, she ends up just watching youtube videos or they end up spooning for 2 hours. Ive heard their conversations and there are many awkward silences. 

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She has dumped him 8 times. Every time it is because something upset her and he did not respond appropriately. She then dumps him and blocks him on FB. A week or two goes by and then she realizes that shes lonely and misses him. He always welcomes her back with open arms. Its gotten so bad that I can predict correctly within 3 days the next time they break up.

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They share the same major but next year, she will be working across the country. His field of study is not very diverse so a part of me believes that he thinks once hes in the work force, he won't find anyone else. I always ask him what he likes about her and all he can say is shes a nice person and he thinks they have good conversations. He is so desperate to stay with his girlfriend that hes whipped. Most of our mutual friends also believe that his relationship is not healthy.

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I told my girlfriend and she said that its his life and who am i to tell him anything about his relationship. I asked him what he is going to change so that it will work. He tells me that every time they get mad at each other, instead of breaking up, they're just going to wait a couple days and then get back together. After pushing him for more, he gets mad at me. I also got mad and told him that from now on I won't ever talk with him about his relationship.

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I understand that its quite literally none of my business but I tried my best to look out for him. I tried convincing him to see my and all our friends point of view by saying harsh things about his relationship. Is what I did wrong? Telling him that his relationship is not healthy and it won't end well? According to my own girlfriend it is. What do you guys think? AITA??

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TL;DR- Roommate has rocky relationship with his girlfriend. I said harsh things about his relationship to try and get him to see my point of view.