title: Git doesn't ask me for username and password after pushing, but I am pushing to another remote
body: <p>I have been pushing to a public repo for a long time, everytime when I do <code>git push</code>, I didn't have to enter username/password, the pushing process just happened instantly when I hit Enter.</p>
  
  <p>Today I want to push my project to my private repo, after adding my private repo to my remote using <code>git remote add private &lt;url&gt;</code>,I tried <code>git push</code> but a fatal error came out and said "authentication failed, invalid username or password".</p>
  
  <p>I mean, I couldn't even enter my username or password, so the username or password I have right now is probably for my public repo. So how do I make git to let me enter username and password again?</p>