Updating your partner is really important in a relationship. Being busy is not a reason not to update your partner who has spent hours waiting for your response or updates.

Entering a relationship is a big responsibility, and if you can't handle the bare minimum that he or she asks for, then don't enter a relationship.

A real man or woman, no matter how busy he or she is, will grab the opportunity to update you because that's how relationships work.

A simple
"Hey, just checking in. I've been busy, but I am thinking of you" isn't hard to do.