Did I do the right thing by breaking up with him?

So, we'll start off by saying that I don't have a facebook. But I was at a friends house, and she does have one. So we got on my boyfriend's page and saw a post on his wall that said, "this is the totally ninja fish @Hunter ********* made for me. Thank you ;)" and had a picture of a poorly drawn fish. My friend clicked on her name and went to her profile. Her alternate name was "ily D" And her profile picture was a screenshot of her and my boyfriend on ooVoo (a video chat thing) with some random inside jokes they apparently had written all over it, and the words I Love You. Under the picture, it said "added yesterday." And had the time around when I texted him asking if he wanted to Skype (another video chat thing), and he said in a little while, even though we never did. He seemed really mad at me that night and he had a friend over (who was my connection to my boyfriend.) Earlier that night, he was trying to get me to tell him i loved him, but I didn't want to say it out loud since my sister was asleep in the next room. He was getting really, really mad and he hung up on me. He didn't answer when i video called him again and he wouldn't respond to my texts. Another thing is, he had been trying to group call me with this Hunter girl, but I hung up before we talked. So when I found the stuff on facebook, i messaged this girl. I asked if she knew if he liked her or not. Well, she told me he had been saying he loved her since the last Saturday, the day after he and I started dating again. I had been dating him for a week, but we've been on and off since December. Another clue there was that he had had his cell phone signature as "peanut butter<3:)" which is part of our song (Perfect Two by Auburn) and he had changed it around the time he had supposedly started telling this girl that he loved her and would do anything for her and all of this stuff. The most heartbreaking part? This girl also had a screenshot of her and my boyfriend ooVoo-ing with the words "Perfect Two" written on it. So I dumped his sorry ***. The thing was, I'm completely emotionally attached to this kid. And he's screwed with my heart before. He's made me cry so many times, and I knew the relationship was toxic, but I kept telling myself it would get better. Big mistake. I know he didn't care about me anymore, and that it barely meant anything to him when I broke up with him. I just want him to hurt like I am. I was going through so much else and then this happens. FOR ONCE, i just want someone to hurt instead of getting away scotch-free. I'm tired of being the only one affected. Advice please? :(