Am I wrong?

Am I wrong for feeling like something is off with how my fiancé and his female coworker are? She randomly sent him a video on messenger yet she doesn’t have him added.

Back story

She’s been working with my finance for the past few months & he’s made some comments about her like how he couldn’t stand how every guy flirts with her & has gone out of his way to make her feel coMfortable at work by talking to her.

He’s even asked me if I would want her to be a third in a threesome with us (I’ve never seen or met her)

He’s made a comment that he later on said was a joke for me & that he never made to her (which I think is a lie because we fought about it & he even grabbed me by my throat & said it was just a joke) but the comment was “oh would you eat my girl out in front of me”

I flipped out when he told me this & was like why the fuck would you even make a comment like that to her. And that’s when he went off & said he didn’t & how it was okay for me to talk to my male coworkers but he couldn’t talk to her. (I only talk to my coworkers about work like the fuck?)

I then told him this morning it’s been eating me up that she went out her way to find & message him on fb & he got mad at me. I told him I feel like you’re hiding something & you’ve added female coworkers before without a word to me so why is this different? And why he won’t add her (I don’t want him to but I was curious) (she also sent him a friend request)

He also talked about how they talk at work & joke around a lot...

He also told me to not go message her because it’ll. Just cause problems at work for him.

I seriously feel like something is up with them....

He doesn’t see where I’m coming from with this & I just can’t shake this feeling....