Guilty... (Warning. Relationship drama)

I dated this guy for I think a month. Previously we had been friends for two years and we decided to date. Me and him were perfectly okay, or so I thought. He dumped me and I was a wreck. He made me a lot of promises he broke and we did... Stuff... So I was attached... Well we decided to try being friends. Until he started ranting and talking crap about his ex. And when I reccommended to him that they cut contact he would instantly start making excuses for her and telling me she was his princess. I ended up lashing out and he said I shouldn't be acting like that because she mentally abused him and that I should be on his side (the side that wants him to date her I mean)((she frikin tried to kill him in his sleep)). So I blocked him. But I've been feeling really guilty about it. I just don't know if I did the right thing. Thoughts?