AITA for not allowing a plus one at my wedding and not discussing it with my fiancé first?

I was engaged to my ex-fiancé “Trevor” for almost a year before we were going to get married this summer. <br><br>Both of us got a dog together while dating, but after the engagement he never had time for the dog. So when we broke up, I got full custody of the dog and received almost no help from Trevor after. To put it simply, he didn’t care about the dog and was more upset that he lost me than the dog. <br><br>I met my current fiancé “Bryan” a few months after the break up and we got engaged almost 6 months ago.<br><br>The issue here is that the dog is very important to Bryan and his family. Both of his sisters have dogs and they’re very kind to my dog. I made sure to mention to Bryan that the dog was from my ex and he said that it’s fine. I also mentioned this to his sisters and they said it’s no problem.<br><br>Fast forward to the wedding planning, my ex and I became friends again. He even apologized to me for how he treated the dog and he wanted to make amends by being a groomsman at the wedding. He told me that the wedding would be a great way for him to make a new impression and show how much he’s changed. I told him that I would tell Bryan and I did. At first Bryan didn’t want Trevor at the wedding, but I convinced him to let it happen.<br><br>Trevor told me he wanted to bring his now-boyfriend to the wedding as well and I said it’s fine. But when I told Bryan, he got really upset. He said that he was only okay with Trevor being there because I was his fiancé and he wanted to make me happy. But he was not okay with Trevor bringing his boyfriend. Bryan told me that it would be really awkward to see Trevor’s boyfriend at our wedding when his family already knows that Trevor and I got the dog together. I said fine, but Trevor got really upset when I told him. He said it was unfair and that Bryan was being immature for not letting him bring his boyfriend. He also said that he can’t come without his boyfriend because his boyfriend’s birthday is a couple days after our wedding and he said he can’t miss two celebrations.<br><br>I told Bryan what Trevor said and he said that it was too late because he already told his sister’s dog groomer to come to the wedding instead. Bryan had planned to bring the dog to the wedding but didn’t want to find another dog groomer because he already knew this specific groomer. Bryan told me that it might be a little awkward but he’s just trying to make sure that our dog feels included in the wedding since our wedding is centered around her.<br><br>So I told Trevor what Bryan said and he told me that I’m being a really bad friend. He said that I’m giving my ex-fiancé priority over my old friend and that I should’ve discussed it with him before making plans with Bryan. He said he’s not coming to the wedding anymore and that he’s disappointed in me. He said we’re not friends anymore and to not contact him again. Bryan’s family is on my side and they said that it’s crazy that Trevor can’t come without his boyfriend. They also said that Trevor only wanted to be a groomsman to show off that he’s changed and make a new impression.<br><br>AITA for not letting Trevor bring his boyfriend to the wedding and not discussing it with him first?