Help with the lying

Hey guys! I've been dealing with bpd/eupd for over a decade now. I've undertaken multiple rounds of DBT, years of therapy and a lot of self reflection (I have a MSW), to the point where my long term therapist was of the opinion that I was in remission etc.

When I entered my first serious relationship that involved actual love, issues remerged. At first I wasn't honest to myself about said issues, but over time I worked on these - they pertained to impulse control and negative coping strategies mainly. It was during this period that I was still neglecting my lying based behaviors.

It turns out I wasn't being totally honest with myself, no pun intended.

I had been working so very hard, every day even, to be a better partner but I still managed to ruin my relationship. I want nothing more than to be with this individual, I've never felt such a connection over my 14/15 years of dating.

So here is where the subreddit may come in - can you all suggest some techniques/strategies to address lying?

I believe I am lying out of fear but I am open to all suggestions and assistance.

I have some rough ideas for approaches but I want some real life examples and success stories as I want to turn my life around and be a better person for my ex partner and my friends.

Thanks heaps in advance!