Yikes ... can answer that one be answered with a long answer or short ... I'll do short here ... While I was trying to fit into "normal" monogamous I always had a feeling that I was in a different place than my partner. I met someone (She is poly) who could feel that in me. She got me to see that it was all right to feel that way!
Long story short ... It's been very liberating and I'm glad I have made this discovery!