Other half's ex

Right, I'm probably going to get judged to some degree here but whatever. I'm going anonymous just in case she's on these forums.

So my boyfriend and I will be going to a wedding soon. I was super excited since being invited as a plus one with my boyfriend. I found out my boyfriend's ex is going. Sound like a big deal? Probably not.

So background story... sorta.

My boyfriend and I have known each other since we were 13 (we're both in our mid 20's now), we've only been together for 9 months but it's literally taken us years to finally get together. I always liked him, but never thought he saw me as more of a good friend. Anyway, he and his ex were together almost 3 years and it was a very messy relationship. She cheated on him hella, stole from him, lied to him about being pregnant with his baby when it was someone else's, she aborted the baby out of guilt and told him she miscarried. This all came ojt in the end and caused him to leave her.

I've known his ex since I was about 16, and we never were good friends. Only a few years ago she started being nice to me. When me and my boyfriend got together, before we made it official, I spoke to her about it because I thought it was the right thing. She said she was happy for us and all that jazz, great!

Not long after that I found out that she used to sit outside my boyfriend's house all the time and wait for him to leave so she could try her luck and this was happening since the break up all until he and I got together! (So for 3 years).

Anyway. I can be civil with her, easily. But ever since I found out she'll be at the wedding I know for a fact she's going to try and show me up somehow, she's like that, trust me. And my self esteem isn't amazing either, and I do get a bit protective. I trust my boyfriend entirely, especially knowing he really doesn't like the girl. It's just this girl is quite the show off, she loves to gloat and she's so patronising. If she's anything like she was last time we saw her, she'll be bringing up her and my boyfriend's past relationship in front of me and make me feel uncomfortable as hell.

I don't know what to do? I don't want any confrontation at all and I don't want to make things awkward. It's just knowing she's still got feelings for my boyfriend makes me feel weird. Am I weird or wrong for feeling uneasy about all this? Any suggestions?