New roomate thats a Bridesmaid

Hello, I have an emotional conflict. Last year I moved out and got a roommate that was a friend of a friend and things were great for a bit. We were getting along fine even though we had just meet and known each other for a few weeks before signing a lease together. I knew and had let her know that we would probably be roommates for one year and I figure me and my boyfriend now fiance will be getting married and things went as planned. So here i am. I got trigger happy and I was excited to plan the wedding and asked close friends of mine to be bridesmaids. I was conflicted in the beginning to ask her mainly because i hardly knew her yet we had been close and she seemed so excited about y upcoming wedding and was eager to help plan. She has helped me here and there. I was conflicted at first because I had noticed she was a bit flaky on past things of mine (like my birthday) and little things I was getting annoyed about but with the apartment but didn't verbalize to keep the peace. So there was under tone of things that was causing me to be reluctant to asking her in the beginning. Plus my fiance didn't think it was a good idea and is still saying he doesn't agree or like her being in the line because of little things and complaints and frustrations towards her. He feels as if she is flaky and self centered and doesn't deserve to play that role. I sort of felt the same way but I see the good potential of people and was drawn to the fact that she wanted to be in the line. I was in a bind with the bridesmaids dresses and she offered to help and did organize an appointment to the shop and got everyone's measurements and took control of it and had already ordered her dress but things didn't work out with that dress because I hadn't had mine and just plans changed last min with the dress and I changed my mind on the dress style because I hadn't got my dress and etc. She did get a refund back and no one had ordered just yet so were were good. Then now looking at different other dresses hasn't happened but I found a dress and everyone sorta pitched in to find a dress so we got that.

Bottom line we are going through alot of underline frustration with each other about the apartment and also just tension with each other right now. I feel like she is being fake and have always felt that way and could never in the past tell weather if she really cared or if she was putting on a face towards me. I just don't trust her and my fiance never did and maybe i just never saw it. Im just thinking I don't want that underline unhealthy tension during my wedding day and am just not thrilled for her to be in the line right now. I want to just avoid it and let it be but I cant and have to face it. I don't know what to do and how to approach this. I just want to be surrounded by real genuine happiness for me and not feel like someone is holding a space. Side not I have more bridesmaids then my husband has grooms men. So another reason why Im conflicted. I guess I felt obligated for her to be on there because she was in the same space when Im planning and she was so sweet and nice. Also Im a recovering people pleaser. Help! Am I wrong for this?