not really sure what to do

I'm in a relationship with an amazing man and we have a poly relationship, he has a guy he's really into and recently I found a guy I'm into, bot my boyfriend isn't comfortable with me seeing other men, only women.

Both me and my boyfriend are bisexual so we never felt the want to date anyone off the opposite sex since we already date each other, but I really like this guy I have been talking to, who is also in a poly relationship. Things were jokingly flirty and at one point I had posted a topless photo on a Reddit page and he happened to see it a few hours later, knowing my username on everything. He msged me a out it and we both joked about it and brushed it off, still jokingly flirting here and there.

And tonight he send me videos on Snapchat of him having sex with his gf, nothing was showing but it was what it was. Idk what to do at this point, I like this dude and I would like a relationship of some sort, even just online as we have never met in person, but my boyfriend isn't comfortable with it and I wouldn't risk losing him for anything. I'm so torn right now.