Helllooooooo fellow borderlinerz!

I started dating a guy a few weeks ago. I have been diagnosed with BPD for 5 years and have done extensive DBT and have a regular therapist, group therapy, and psychiatrist. I feel confident that I can have a healthy relationship because of where I'm at. I just met someone I really like. 

Date 1: We got drinks, saw a movie, and...had sex at my apartment all night (not great for my attachment/abandonment issues)

Date 2: My therapist told me I should try to keep this one short and not sleep with him. We got wine and cheese and went for a romantic walk where we made out a lot. He asked if I wanted to come over and I literally said "No I'm sorry I want to but my therapist told me not to." FACEPALM. WHY. He was actually kind about that response and understanding, but when he pried a little further, I told him it was because I used to go to SLAA meetings, and explained what sex and love addicts anonymous was. This is not technically a lie, I did go to those meetings before I was diagnosed and realized what I was actually dealing with. It just seemed less scary than telling him I have a personality disorder. 

Date 3 is tomorrow. I plan on having sex if he wants to, I'm going to his place to hang out with a puppy he's dogsitting. I'm just terrified he's going to ask more because obviously sex is a delicate issue if he thinks I'm a sex addict. It feels like a lie. I'm a bad liar. What if I tell him I have BPD? 

TLDR: I told a guy I recently met that I was a sex addict because I couldn't tell him about my BPD.