I brought Rob to my friends houses while on a so called date. However I don't think most of the dates were really dates. They were more like, hey, lets all hang out so no one feels left out. I brought Rob to a sleep over twice (my friend lived out in the country & its just easier to sleep on the couch then drive back home).

For the past 7yrs Tom has come on just about every date i have had with Rob. I think it helps keep Rob & I together as we have nobody crying that we are ignoring them.

Can the 4 of you go to a movie? or rent movies & order pizza?

But if you do call this 1 date off, do what was said above. Make a new date asap & let him know how thankful you are that he underdstands & cares about your relationship/wellbeing of your friend.