If you are dating a compulsive liar, you can encourage them to seek counseling. A compulsive liar may benefit from professional help. You can also see a licensed mental health professional on your own who can help you understand lying and relationships with those who lie.

Is it possible to date a compulsive liar?

Its entirely possible to date a pathological liar and never even know. Pathological lying (or Pseudologia Fantastica in psychiatric terms) is a tendency to habitually lie for no apparent reason.