Me and my partner in the last months started to date people in order to have a threesome (we're monogamous right now, except for kissing other people being allowed). I'm cis female and he's cis male, we're dating all genders. I am more sexually attracted to men, or let's say they're my focus sexually, but I also have felt sexual attraction towards women or other genders. My partner doesn't feel attracted to men, however he would like to explore being sensual with men more. So I would imagine that in a MFM threesome my partner won't do anything sexually with the guy. However, he fantasizes a lot about sharing me with other men and this is the main reason for him to want a MFM threesome.

Now we had our first date with a guy a month ago (which resulted in a bit of kissing/touching but not more) and have another one planned for the weekend about which i'm pretty excited! However, we talked a bit after our last date and he told me he experienced slight discomfort not during, but afterwards when he realized I just kissed another guy in front of him. He said it was really not that big of a deal and he could cope with it well, and it didn't last. I also know him as a person with a stable ego who can handle such negative emotions pretty well. I'm still a bit afraid that his reaction will be worse if he sees another guy fucking me and everything instead of just kissing. Still, I would be super happy to hear from more experienced people what you can do in my position to make him more comfortable and ease such negative emotions before our date happens. Like what can I really do to ease such feelings of jealousy or disconnect?

Another thing that I want to safely navigate is how the way in which we meet new partners may affect his feelings. So far we've only searched on a dating app, and we meet the people together for the first time. But recently I've also met a guy when I went out to the club by myself who I found hot and would like to date as well at some point. However, there is this thing about me having a "previous" relation now to this guy that may affect how my partner feels towards him. I think in this situation it would be even more important to communicate properly to my partner about everything, but I don't really know where to start.

Thank you :)