My coworker

You let some guy already married come over and bang you every once in awhile and now you're concerned that you might be viewed as an 'object' lol Yes. You are an object.

Did his wife tell you that it was okay for you to be messing with her man? You know it's possible that this dude might have been lying about his so called open marriage.

I think in this case, yes you seem to be a sex object/outlet for him. But it also sounds like that was the arrangement?

Not something I really know about but it's my impression "open marriages" can have different sorts of rules and ways people go about it. You might have hoped for something more like polyamory where you would get to also have a relationship with him, in addition to the one he has with his wife, where he and she might have more of an "you can fuck other people but I'm your life partner and they're just an outlet for your sex drive, or you fucking them is just a way to spice up our own sexual dynamic" kinda thing going on.

Did you discuss the parameters beforehand?

I don't think it's necessarily a bad thing to "use" you as an object in this regard, as long as he's respecting your personhood and this is something you agreed to. The way you phrased it makes it sound like you're questioning if he's a bad person, and you didn't give a lot of information but if anything he sounds respectful in that he's doing this with his wife's consent instead of behind her back, and maintaining his boundaries with you by keeping it only a sex thing.

But it sounds like this is really about you wanting more, and you might end up disappointed in that regard.

Look at it this way. You are also using him as an object. So, just enjoy the no strings attached sex!

I’ve literally spoken about their open relationship with his wife. I don’t understand why everyone thinks I would come on here and lie about my own post.

Some guys are not romantic like that

I do not see where the problem is. you don't have feelings either. if you had feelings you would share something other than sex with him. men are not objects only there to satisfy our impulses.

To him you’re only a way to bolster his fragile ego. He’s obviously resentful of his strong woman and is using you as passive regressive revenge. And how can you say that you respect his wife if you’re fucking her husband behind her back?