Is Lennie a burden?

I think that Lennie is a burden to George to some degree. I think this because he has to keep Lennie out of trouble. He alos has to explain things to him and remind him about things since he always forgets. George can't just leave and go somewhere, he has to take Lennie with him to keep an eye on him. Life would be a lot easier for George if he didn't have Lennie.