oh goodness, i regretted it absolutely every time i found out something i didn't want to know about. through emails, phone calls, secret meetings, you name it. i knew i had been cheated on, i knew it would no longer work between us, and i still kept making myself miserable - almost on purpose! it was like a compulsion, i just had to know the truth, and i can't even tell you how physically and emotionally sick i would be after i uncovered a secret. i was so destroyed, and i could have easily avoided it.
now, months have gone by, and i have no desire to read emails or learn about anything more than what was offered to me. i try avoid my ex at all costs... no more checking in or keeping tabs. my feeling was to always follow your gut - if you think something is going on, it probably is. but i'd rather not confirm it by snooping... nothing good can come from it. in this case, i think ignorance is bliss.