Does anyone else feel rejected by their LO even though their LO is in a relationship?

I realize this is very twisted and doesn’t make logical sense, but my LO is in a relationship, so I should see that as a clear boundary. Instead, I want him to want me, and I feel rejected when I don’t get signs of his interest. We also work together. I’m so infatuated with this man even though I know he’s in a relationship. I look for crumbs, which I sometimes get, to validate the hope that he may have some interest in me. When I don’t get those crumbs, I feel so heartbroken and rejected. It makes no sense given that he’s in a relationship, but it’s not logical, it’s limerence. I feel like I’m caught up in a spell and just wish there was a way out of it.