Undecided/other. Cause technically I am polyamourous, in the sense that I sometimes am in love with more than one guy at once, but in practice I'm monogamous in the sense that I only ever date one guy at a time. I can only devote myself to one partner as I love unequally, meaning in such situations I always love one guy more than I love the other or other ones and that's unfair. I also don't like the idea of being in a poly or triad relationship. It seems too messy, stressful and complicated. If a future partner of mine would suggest such, I'd say no.
I prefer open mono relationships though, and of course that goes for both me and my partner. I'm really not the jealous kind of person, and I'd want for both me and my partner to not be restricted to only each other sexually. My idea of an ideal, would be to have 'one love, and many lovers'.
I've been single for a little over a year now, but my past 2 relationships were open and I really liked that kind of arrangement. I think it was me who brought it up as a suggestion/question both times, and it was positively accepted. For now I enjoy being single and not in love with anyone, but also enjoy to sleep around and have friends with benefits. It's comfortable, but I also know I'm most likely gonna fall in love again at some point. But I hope not too soon.