>> that was my dad. >> but across town in long beach, janos kulcsar wasn't so forgiving. e was fuming. >> janos truly loved her. love boring on obsession. unfortunately it takes two people to quit the relationship. and janos was just not going to accept it. >> and here in his little apartment, he prepared a secret plan to get her back. >>> coming up, an old pair of pants reveals new secrets. >> when i saw the report where he said there was dirt on the pants, that's when the light bulb went off for me. >> when "dateline" continues. a place where everyone lives life well-protected. ♪♪ and even when things go a bit wrong, we've got your back. here, things work the way you wish they would. and better protection costs a whole lot less. you're in good hands with allstate. click or call for a lower auto rate today. trelegy for copd. ♪ birds flyin' high ♪ ♪ you know how i feel ♪ (coughing) ♪ breeze driftin' on by ♪ ♪ you know how i feel ♪ copd may have gotten you here, but you decide what's next. start a new day with trelegy. ♪ ...feelin' good ♪ no once-daily copd medicine has the