CHICAGO — Caleb Williams’ last throw in regulation was a backpedaling, fourth-down rainbow that landed in Cole Kmet’s hands in the corner of the end zone for a breathtaking touchdown.His last throw of the game was the beginning of the end for Chicago’s surprising season.Williams almost rallied the Bears to another memorable win on Sunday night. But he threw his third interception in overtime and Matthew Stafford drove the Los Angeles Rams to Harrison Mevis’ winning field goal in a 20-17 victory in the divisional round of the playoffs.“It’s tough. In these moments, you feel that you let your team down,” Williams said. “You feel this or that. It’s a good lesson learned for us, first time being in this situation for me and for us as a team. I’m excited for what’s to come. But obviously going to go back and watch this and figure out how I can be better, and that’s the exciting part.”The 24-year-old Williams led Chicago to an NFL-record seven wins this season when trailing in last 2 minutes of regulation. He threw a 25-yard touchdown pass to DJ Moore with 1:43 left in a 31-27 victory over Green Bay in the first round of the playoffs.This ti …