So what if I stop using Latisse? Will my eyelashes go back to what they were before using latisse?

Latisse stimulates the growth cycle of the eyelash follicle.  Thus causing the growth of longer, thicker lashes.  Without that stimulus, your lashes will return to their original condition.

Once you stop using Latisse your eyelash growth will begin to return to where it was before you began using Latisse.