Why Did I Cheat?

I never thought I'd be the kind of person who would cheat, but here I am, divorced and trying to figure out what exactly happened. It all started with a business trip where my colleague Alex wasn't just professional. One night turned into another, and soon we were in this deep, hot mess. On that first night, as our clothes fell away, there was nothing vague about it, his cock was hard against me, inside me, thrusting deep and relentless until I felt every inch of him stretching me open. It continued for months, with each session hotter than the last, until I couldn't deny it anymore. Why did I let this happen? I'm still trying to figure out if it was a momentary lapse or something deeper.