I wanted to help a friend move but I was so busy I didn't realize the time.
Oh no! How did you feel about that?
I still feel bad about it because I really wanted to get there on time.
It's ok you were busy and you lost the track of your time. I hope your friend understands it.
Thanks I feel better talking with you. It's a relief to me.
As long as you feel badly and apologized, I'm sure your friend understands. No need to beat yourself up over it.