It is only complicated if people are unwilling to be honest about their wants and needs. There is no crime in saving your heart for only one person, but neither does that need to be the only option for those who are able to take multiple partners.

[Chiron is so poly it backhands me everyday]

In my circumstances, I am only... romantically inclined towards one of them, we shall say, but I cherish the other two all the same.