After Meursault arranged for his mother to live in a nursing home, why did he visit her so infrequently?

From the text:

During her first few weeks at the Home she used to cry a good deal. But that was only because she hadn’t settled down. After a month or two she’d have cried if she’d been told to leave the Home. Because this, too, would have been a wrench. That was why, during the last year, I seldom went to see her. Also, it would have meant losing my Sunday—not to mention the trouble of going to the bus, getting my ticket, and spending two hours on the journey each way.