[Polly101]

Awww don't worry you can just tell him that "I have problems in mai life too but ill come back to you as soon as I can" don't say you're a bad friend you're actually really friendly! ; o ; it's no problem if you forgot nobody's a superman that they can solve every little problem which is bugging them..
Ups and downs happen in life even to me I lost some of mai really important friends they said I'm a bad friend but I didn't mind and I kept being "myself" and when they had problems they came to "me" to solve their problems and now they're mai bestest friends! >o
Nobody can do so well in remembering things like I forget math problems when I go give mai math exams, it's no problem if you forgot you can just comfort your friend later and say everything!