I'm going to tell my friend how I felt about something that happened a few days ago
Why are you upset with your friend?
It's something I don't like to see in my friend's behavior.
It's good to tell your friend the truth. If there is something that bothers you about them then you should be straightforward.
I don't really like to bother my friend and I don't have time for that.
Friends should be straight with each other and you should try to make the time to address them. Show them how you feel and let them know the reasons why. You'll have a better bond as friends by being this open.