Hacallard,
One of the things I have learned the hard way, if you want something you need to ask for it. The less drama and more honest you are the better the results usually are.
I agree with Lily, email your friend and tell them the truth. Some of my friends are great multitaskers, some are horrendous. I accept people as they are. Hell, I sure as hell am not perfect so why should I expect anyone else to be. Those who can't multitask, well I spend extra time with them. They are my friend and I make sure they get the time they need. There are some who need more of my time and friends, hell I can see them once every year and we pick up like not a day passed. There are others who feel if I haven't called them once a day that I just am not interested in being their friend. Their feelings are hurt. The only way I know these things is I ask. People can't always read or know how their actions affect another. Don't be afraid to speak up, especially if it is a friendship you want.
Hope it helps.
Wayne