Am I wrong

I am a 28 F. My husband (34M) doesn't think it's wrong if he says hi to a high school crush that was a small fling 10 years ago. We go to his friend's birthday parties and she's there all the time. She has a husband and kids. I normally don't care if he talks to females but she's a bit too much for my taste. She has big boobs and goes in for the tight hugs with my husband and she's just too friendly in my eyes. I personally would like for him to not even say hi to her let alone socialize with her. He respects my wishes and says he'll do it for me but doesn't see eye to eye with me or agree with my requests. Am I wrong? Also he has cheated a lot so l am coming from an insecure place. We are working it out and he's doing better. But small things like these he can't seem to comprehend why it's so bad to socialize with a high school crush. He thinks because it's been 10 years and they have separate lives it's okay to laugh and have fun with her at parties.