If I Knew - Bruno Mars

With Anderson Paak and Bruno Mars' single coming out in just a few more days, here's a song that just came to my mind this morning. It's a short song, a little over 2 minutes from his 2012 album Unorthodox Jukebox. It's a bittersweet song about his past lover not knowing she would've wanted to come back to him and wish haven't done the "things" he did. I am guessing that involves some bad decisions on his part.