Hi Jo,

If he is constantly lying that is one thing, but if it one lie (I think as humans, sometimes it is nature to tell a white lie now and then, as long as it is not hurtful to the other person, or done repeatedly). In this case, he apologized, and felt very regretful. I think he wants to change, and he cares for you very much. It could be an issue of mistrust given to him in previous relationships.

You had mentioned seeking therapy. I would do a wait and see approach. Especially, if in other aspects he is treating you well. Lying is something that can be resolved and worked on with quality Psychotherapy. I would take a step back from the relationship for awhile until he gets his issues with distrust, etc resolved. If the lying contines, I would re-evaluate the relationship..as when trust is broken, it is almost impossible to get back. Keep us posted with your thoughts. x