Venting

So, I've been planning my fiancé and I's wedding for the past few months, and my photographer backed out on me. So I posted on Facebook about how I was looking for someone who could be a photographer at my wedding. A little background, about six months ago my fiancé and I were talking about people we went to highschool with (we are highschool sweethearts), and he mentioned this girl I knew that he had a huge crush on. He mentioned how "That was the only girl he'd ever leave me for." We got into this huge argument about it and he slept on the couch that night. He said he was joking, but it really hurt. Well, one of our mutual friends tagged her in a comment on my post (she's an amateur photographer/not licensed), and I told my fiancé, jokingly saying how awkward that was and he's all like "Why not!? She takes awesome pictures!" So now I'm fuming, because like no, why would I want her at my wedding? Not that I don't trust her or him or anything, just because of the simple fact it's awkward and I would be uncomfortable at my own wedding, and he's acting like I shouldn't be mad at all. Like I should forget the past because she charges less an hour. Should I be mad, or am I overreacting?