Of course I'm not sure -- that would be quite silly given my track record =)

What changed my mind...I'm still working on this one[1]. It was half conceiving a specific ideal of myself -- looking at the way I had experienced jealousy in the past and deciding that that wasn't a part of myself that I liked, wasn't a set of motivations that I endorsed. And it was half looking at how poly relationships seemed to work, and deciding that they seemed better engineered[2] to my eyes -- they don't present some life-altering crisis every time you realize you're really really attracted to someone else. They allow for an ebb and flow of relationship intensity -- friends become lovers become partners, break up, wind up friends and occasional lovers -- that appealed more than the almost catastrophic shifts in status that monogamy seems to require.

[1] As I write this, it occurs to me that I should probably start being suspicious when I say things like this -- I suppose it's entirely possible that this simply means "My brain is still piecing together the optimally self-congratulatory story for me to tell myself." I need to journal more.

[2] If this seems an odd turn of phrase, it's worth adding that I'm a software engineer by trade, and that the parts of my brain that made these judgements felt like the same parts that look at a piece of code and decide whether it's well-factored, maintainable, etc. etc.