Aw, you are so welcome! We're glad you're enjoying it!
If the ending you're referring to is what I think it is-- trying spending all of your time with Malik or Burdoc (choose only one) until the very last available day, where you should then talk to their counterpart. 'v'/ The game gives you a little hint when it's time to make up with your buddy, but keep an eye on your calendar and you should do fine!
Hope that helps! Can't give too much away! <3