In addition to my fiance' I have a friend I rehearse with a couple times a month, another friend I manage to get together with once every couple of months, have a few PM exchanges with friends online, and occasionally talk to family on the phone.
I find that the social interactions required for work tend to do me in without enough recuperation time. I've been a bit overtaxed and today just hit the wall. I had to go home feeling nauseated, but also I just couldn't interact because of being overtaxed with people interaction for too long. I like people, but it is more just like being in the bright sun for too long and needing some shade.