I would certainly say that, at the very least, this situation requires a serious sit-down conversation!
One problem is that, in the OnlyFans era, we're starting to see a lot more blurring of the lines between simply watching sex online and actually interacting with the person at the other end--because the OF business model encourages that type of interaction. That is only going to bleed more and more into this sort of behavior.
Also, as a partner, you have the right to know here if your man is guilty of "putting you on a pedestal". You may have an active sex life, and at the same time, your man may be unhealthily drawing a line between you, his treasure, and his deeper sexual fantasies...and this could be leading him to entertain the idea of at least talking with women with whom he would theoretically explore those fantasies. This, right now, is the time to change that. That sexual exploration should always start with YOU, even if the only thing you're doing is talking about those fantasies in bed.
As other posters have said, this could be a sign of a deeper problem in your relationship or with this man...but it could also be an opportunity to have a serious sexual conversation that leads to your man understanding that respecting you means sharing his WHOLE self with you. Force him to be honest, and at the same time, don't feel pressured to follow through on any acts that make you uncomfortable. What is he telling himself he can get from these other women that she SHOULD be telling himself he wants to explore with the person who matters the most to him: You?