Was this wrong of me? (Story time)

So I started dating my friend of about a year in August. Things were really great until November when he stopped taking his bipolar meds. I tried so hard to get him back on them but he just kept pushing me away. He said it was because his grades were bad and he was suspended from baseball and needed to focus on them. So anyway, we were getting much better almost back to normal before Christmas break started (we're in college) but about a week after he went home he just became sort of distant again. I kept asking him if everything was okay. If he even wanted to be with me anymore. If he was seeing someone else because right before break he kept acting weird about his phone when he'd get a text like he didn't want me to see it. I'm not dumb, I knew it was sketchy. All I wanted was the truth so I didn't end up feeling dumb for believing him. But every time he'd tell me that it's stupid to think that blah blah blah making me feel bad when now I know I shouldn't have. So Wednesday night I told him I wanted to stop wasting my time because he just isn't putting in the same effort as me and it's tiring. Really tiring when you're trying so hard and they act as if you're just an option. He says "sorry? well I'm still going to talk to you". Well later my friend "J" came to my place and she told me his ex "K" recently got mad at him for seeing "J" in his phone. I thought that was odd because how would his ex see that. I texted my now ex "so if I asked K if she knew we were still together she would be ok with that?" Instantly he freaked out. Called me a psycho told me to leave him alone and never speak to him again. So I messaged her because obviously his reaction proved he had something to hide and turns out he's been trying to get her to come to his place every single night, Sending her dick pics, asking to have sex again so their connection can be back, sending her porn, tells her he loves her and I'm just pussy to him, he even had her in his bed that I would sleep in every night one night while I was out and she was in town. She said they never had sex since they broke up months and months ago but she showed me proof of all the other stuff. I felt so much better after that honestly. She thanked me for telling her he was still with me because she knew deep down he was lying about it. She said she can now move on without worrying she made the wrong choice. Now I know I shouldn't feel bad for breaking up with him. He's a pos and now he lost both his girls. He texted me drunk that night telling me he hates me and I had no right to message her and that I ruined his life abd now he wants to ruin mine. That he loves her (found out he cheated on her multiple times) and I never meant anything to him and that I don't deserve better than him. He said I will never find a guy who wants to keep me. He even went as far as to blame my best friends suicide on me. I told him if he really loved her he would've dropped me a long time ago. Not kept dragging us both along. Then later he calls me begging me to tell him if I was currently in bed with another dude?? I told him my life is no longer his business so he can stay out of it and he hasn't tried talking to me since. BEST PART: Next day K texted him something and he replied "I never really loved you I just wanted in your pants again. Don't feel special". He's absolutely psycho off his meds I'm now finding out 😂 Am I wrong for messaging his ex? Because most people say they would've done the same thing but I've had a very few say I went too far. Personally, I'm glad I did because otherwise I never would've known any of this and I just saved her from falling for his lies. I've realized how I should be treated by a guy who truly cares. I came out of this with a lesson learned and feeling happy I didn't waste anymore time on him. I instantly lost feelings for him when I found this out. Am I hurt? Most definitely. Would I ever take him back? Oh hell no. 

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