Actualy, that's not a good idea at all.
Male dwarf gouramies will do fine on their own. They are territorial, and as you saw with the previous dwarf, will chase others of their kind away from their territory. He's nervous right now because of the sudden change in environment but he should eventualy get over it. Having small, peaceful schooling fish in the tank with him and/or lots of tall or floating plants, will encourage him to come out more. Similarly, make sure your filter isn't producing too strong a current and try enticing him out from time to time with some tasty live foods.
Seeing as you say this one is brighter than the timid one, you may even have had a female in with him before (females are silver - males are the colorful ones).
If you are interested in keeping some more dwarfs, then get 2 or more females. With two or more in there, his attention will be split between them so neither will be overly stressed. Particularly with dwarfs, this is extremely important as stress can easily lead to disease and, subsequently death.
Ashli, you have 6 gouramies - that's why you don't have problems. If you kept them as pairs, you certainly would have a problem - especialy if yours happen to be three-spots.
Also, don't try to keep a three-spot with your dwarf (or any of the three-spot color morphs - golds, blues, lavenders, platinums, cosby or opaline). Three-spots don't like other gouramies much and can be extremely aggressive towards smaller species. A three-spot would most certainly end up bullying your dwarf to death.