I have to be a point of disagreement here.

I'd assume he just wants to ride, unless there's a serious indication to the contrary. Go for a ride, mention the boyfriend (my boyfriend and I are going out to diner tonight, etc). That way, he knows. You could even mention it when calling to set up a ride (I can't this night, BF and I have plans). And you haven't assumed he was interested in something he might or might not be interested in.

Maybe he doesn't want to hammer with the team all the time? Maybe your riding matches with his training style? I just wouldn't see it as a problem.

CA