Hi MaxM,
Yes, many egg layers will go thru the motion from time to time. It's totally natural. In nature, and better seen in captivity, there are a lot of egg laying species that sometimes become 'confused' when it comes to mating.
For the future, let nature takes it's course. Clearly without the opposite sex the eggs will never be fertile. If you do see another egg deposit, quite often they will eat their own.
As for adding a Gourami, in my experience... go for it. Gourami's (especially the dwarf variety) are pretty laid back.