Im not polygamous specifically but im non-monogamous.. either way, for some people its possible.. I view love as something beyond romance, and just as i can have and love more than one friend I could also have and love more than one partner. And I think that the love for a partner isn't even that much different as love for a friend, the main difference would be the physical attraction part i guess, so an ideal relationship for me personally would be just like a good friendship but with physical intimacy.
I actually never had more than one partner simultaneously and also I think i might fall somewhere under the aro spectrum, so i cant rlly talk much about my experience lol. But I've done much research on this topic and I've learned that poly people can actually love and feel romantic feelings for all their partners just like everyone else, but they also acknowledge that one only person doesn't have to be their everything (for ex. I might enjoy cooking and going to music concerts, but my partner hates cooking. I dont have to ask for them to cook with me bcoz I can do this activity with other people that actually share this interest with me, and that way nobody gets overwhelmed or has to do smth theyre not into, and the same goes for other and more serious relationship stuff).
As for jealousy, its natural for it to exist in small amounts in basically any relationship, its only bad if its too much or in an unhealthy way. In poly couples jealousy might be stronger but ideally everyone would learn to cope with these feelings and communicate well to avoid arguing over these stuff. Besides, there are many "rules" and agreements that the group must determine in order to have a healthy relationship, for ex. "i dont feel confortable when u do this thing with him, pls dont do it when im present" "ok!!" Yayyy
so thats kind of all i know on the topic :p