Needing to vent!! *LONG POST*

So my boyfriend and I have been together for over a year and we have a 4.5 month old daughter together. He has a bit of a drinking problem and it has caused many arguments in our relationship. The end of March he left his daughter and I at home all night while ignoring my calls/texts. I find out from a friend of his he is super drunk and was getting ready to leave their house. I had some person follow him home while she was on the phone with me and she made it sound like he was going to kill someone and/or going to hit something. I was worried sick to my stomach so I called him in and he ended up getting a DUI that night and blew 2.5 times over the legal limit. His friends told him about a week later it was me who turned him in and when he asked me about it, I lied and said it wasn’t me. Fast forward to Tuesday of this week, I finally told him it was me and that I was sorry and I was worried about him. He ended up telling me he was going to leave me and his daughter. We sat down tonight and had a heart to heart conversation and agreed to make things work out....he thought I left the house to go to town but I was actually in the bedroom and he called his friend and told him how he wants to get even with me and make me feel the heartbreak I caused him and wants to cheat on me and talking about his moms friends tits and how he wants to see them, but he told his friend he just can’t bring his mind to do it...UMMMMM.....WHAT?!?! So I asked him about it and he said he wants to cheat on me to get even but he can’t bring himself to do it. He won’t even sleep in the bedroom, he’s sleeping downstairs. I am just at a complete loss of how getting a dui and cheating compare at getting even. I told him 2 wrongs don’t make a right. It’s now 5am and he’s still on Facebook but when I text him about our daughter he ignores me. So my question to you guys is am I in the wrong for turning him in for driving drunk or did I do the right thing??