from my experience dragons are social animals, which is one of the reasons they are engaging and interested in their surroundings in captivity, but it does not mean that you must bring another dragon. They are usually friendly to opposite sexdragons but it does not have to be so , try and check with your pet shop sales person if you can take the other dragon (that is if you are interested in bringing your dragon company) you want for a day or so just to check if the two are getting along.
Dragons seem to love attention, so just play with him when you feel like or when you feel he likes to play.