Questioning: Polyamory

I’ve always considered my sexuality as pan. I like people for their souls not their looks or parts. But now ive been in a relationship for almost a year (my longest relationship). I’ve never truly believed in labels but it sort of helps me... In my current relationship I sort of feel like I could also love somebody else... like I need another person... I love my boyfriend so fucking much and could see marriage in the future. But I’m still young and want to explore option before I get tied down. But I am tied down with a guy a love and want to spend the rest of my life with. Idk if I’m non monogamous and/ or need an open relationship..? It’s a hard spot to be in and I’d appreciate any similar experiences, thoughts, or advice.