How to go from polyamory to one-sided polyamory without hurting his feelings?

I (27F) met this cute guy (29M) a couple of weeks ago, right now we are "dating", everything is moving fast and so far he's treating me like a princess, honestly I love this kind of treatment from him, he acts like the perfect boyfriend. Before we started dating we both made it clear we wanted to be with other people while knowing each other, that's great as I can't for the life of me be on a monogamous relationship, trust me, tried it many times and no matter how much I think I love him it just doesn't work, I can't change it. The thing is, (and I know I'm being extremely selfish) I am extremely jelous, I don't want him to be with other women. I will get mad if he does, I know, I'm being unfair, but is how I feel. So I plan to tell him how I feel about it and what would be the perfect scenario for me, and that is one-sided polyamory, only I could see other people. I don't know how he will react, maybe he gets mad, maybe he dumps me, or maybe he likes the idea, and I say this because based on the previous conversations we had he might be a bit into that type of relationship… I won't go into details. The problem here is that he's such a great guy and he's being so kind to me I don't want to be rude to him or hurt his feelings, I thought about telling him while we have sex so he could be more open about it, but I'm not sure if that would change the mood too much. So if anyone here could give me some advice about how to proceed without disrespecting him too much I would be grateful. Refrain from lecturing me please as I already know I'm being unfair and selfish. Thanks