Questions about my Six Line pair

[SoFloReefer]

I have two Six Line Wrasses. The larger of the two I've had for 4 to 5 years and a smaller one for about 16 months or so. They live in the same 160 gallon tank. I'm it the process of breaking down the tank and now that there aren't many hiding places, I've noticed that the two fish have been swimming around together. I think that they might be a pair. I was thinking about giving the larger one away but if they are a pair, I don't want to separate them. Is there any way to tell for sure? Also, how rare is a mated pair of Six Lines?

[Sugar Magnolia]

Technically, they would only be a "mated" pair if they spawned. I wouldn't be too concerned about splitting them up.