Hello, <br/><br/>I need your help with a few sentences related to the verb 'concern', please. <br/><br/><b>- He isn't concerned about you.</b><br/><br/><b>(</b>What does that mean? Does that mean <i>he is not worried about you</i>, or <i>he doesn't care for you</i>?<b>)</b><br/><br/><b>- It's not my concern.</b><br/><br/><b>(</b>What does it mean, please? Is it the same as saying <i>it's none of my business</i>, or does it mean something else?<b>)</b><br/><br/>Thank you.