My daughter was somewhere in that age range when "suddenly" I wasn't at home every day when she got home from school anymore. I'd been an at-home mom, also there for all the dance classes, gymnastics, and whatever, then once she was in junior high, I started teaching sewing type classes once in a while, and working one day a week at a local sewing machine dealership. It never interfered with taking her to stuff, but sometimes I wasn't there when she got home.

She had this "undefined mad" going on for a few weeks, and then one day, came and apologized: I finally figured out why I've been cranky Mom. I've been mad at you for doing your own thing, and suddenly I realized that you deserve to have a life too, just like the rest of us! And then she wasn't bothered by my doing stuff away from home anymore...

Maybe your biking is new enough that he's just not adjusted to it being part of your life now?

Karen in Boise