Forgiveness...? Help

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I'm here because I need help to clear a situation. I was with some friends and I was venting about my boyfriends ex wife (that I didn't like the fact that she was always texting him and calling him, but they have a kid together but still I did :/) to one of my friends and the next day I came to know that my boyfriend received a call from his ex wife. He was upset and I tried to talk to him about it and he didn't wanted to hear it. The next day, I decided to contact the person who said what I was saying about his ex, and we resolved the issue but then another "friend" hear it and told his ex wife and I wanted to contact her to keep the peace with her, but of course she doesn't want to see me but the ex called my boyfriend and backlash at me again. Also, the ex was upset by the fact that we all became friends on Facebook WTH! I just need help to actually have a conversation with my boyfriend so he can forgive me and gain his trust again. I know it was my bad saying this things and I feel terrible and I deserve it but it has been 4 days since it happened and each day it's getting cold and different between us like we are roommates more than a couple. My birthday was 2 days ago and he didn't said nothing or gave anything. I feel like he is punishing me :/ Please help! all I want is to save the relationship back and for him to trust me...