I was in a similar situation when I was 27, with a 34 year-old woman. However, she wasn't married but she did have a kid with the guy, and their relationship wasn't bad, just mediocre. We flirted for months and went out on a couple of dates. She was beautiful, and I was willing, but she had an attack of conscience the night we got a hotel room together. So we never had sex and soon parted ways. A month later, he was snooping through her bank statement and found that she had written a check to me for about $100, which was reimbursement for her share of the hotel room. He called my number and left a voicemail death threat. I was already done talking to her and had moved on, so I laughed it off and had some friends listen to it. But my friends were spooked, and eventually it sunk in then I could have gotten killed over this stupid affair. I never went after another guy's woman like that again.
Good decisions come from experience. Experience comes from bad decisions.