Is it weird my boyfriend didn’t get a plus one invite?

We’ve been dating for almost 4 and a half years, have lived together for 2. He got a wedding invitation for someone he’s known for probably 10+ years who I’ve met multiple times but we don’t see often. I’ve met him a few years before he met his fiance, and have met her a handful of times. It’s a destination wedding, but my boyfriend didn’t get a plus one.

I’m very sensitive and feel a little offended. Should I not be?