Do you mean it was the first time riding this year or first time riding with friends?
If it was your first time on the bike this year then no surprizes you couldn't keep up.....
Marathon runners don't ride bikes to improve or maintain their running fitness and cyclists won't maintain let alone improve their cycling by running alone.
Want to get back to where you were? then do what you did to get there in the first place, IOW ride your bike.... A LOT,
if running is imortant to you then by all means keep running but your cycling will never be as good as it could otherwise be;
you have a choice to make,
be OK at both or much much better one or the other.
Running is not important at all for me. Just wanted a quick and ''fun'' way to lose weight during Canadian winter. (I enjoy running)
The 4months at Police School this autumn eating crappy cafeteria food hasn't helped.
Seems like hill repeats and extra cycling will do it.