My best friend doesn’t want my bf at her wedding ?

So my boyfriend and I have been dating about two years, we are absolutely in love, he’s also very protective which I will get too. My best friend lives out of state she moved away about a year ago, she met a guy and they are getting married in a couple of months. Originally, my friend said bringing a plus one was fine, and she gave me recommendations on hotels were me and my bf could stay for the wedding. I am a bridesmaid as a well. Well maybe a few weeks go by and my friend says my boyfriend is no longer invited because they have limited availability for the venue. That really stinks, and my boyfriend was offended, but I also understand that sometimes things like that our out of our control so I wasn’t upset with her in the slightest. I told her that’s fine, my boyfriend would still come with me and he would just hang out in our hotel while I was attending the wedding, he wanted to do this because he was t comfortable with me traveling that far by myself, which I appreciate. I told him he didn’t have to do that, but he said he wanted too. My friend was fine with this as well and thought it was sweet of him, but then a couple more weeks go by and she says my boyfriend shouldn’t come at all, because she wanted the bridesmaids to go out the night before the wedding, and also because one of the other bridesmaids was having trouble affording to stay in the hotel because she is also from lit of town, and she wanted to room with me. How am I suppose to take this? I mean I do understand seating availability and stuff happens, but the fact that she consistently changed her mind over and over about him attending, why not just tell me ahead of time he can’t come? But also why does it matter if he comes or not if he’s not attending any of the wedding events at all? He just wanted to make sure I wasn’t traveling alone. Also why does him being there stop us from going out the night before if he wasn’t attending anyway? Maybe I’m just not aware of how weddings are suppose to go, could someone explain this to me? I guess I’ll just have to go by myself and room with this random girl?