Forgive my tone, but you need to cut out that emailing the other guy stuff ASAP else you're going to heap misery on yourself.
Shortly after my W and I started making "a little" progress, I started getting more unsolicited attention from females than I had in a long time (coincided with my working out, losing weight, dressing better, more confidence, etc.). I was REAL tempted to go for it, not for the sex, but for the attention and the need to be wanted by someone else. That never in my life was an issue before the bomb dropped and we started piecing.
I resisted. At one point, I just left work and went home to my W in the middle of the morning, sat and watched her organize photos or something for a while.
Remember...attraction isn't anything more than an addiction, and most addictions ramp up gradually, one finger at a time, until the fist is around your neck.
You keep using that word. I do not think it means what you think it means. -- Inigo Montoya, 'The Princess Bride'